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SAT word list - I
ichthyology study of fish
icon n. painting, carving, etc of a holy person, itself regarded as sacred
iconoclast n. person who attacks popular beliefs or established customs
idealize To make to conform to some mental or imaginary standard.
idiom n. phrase or sentence whose meaning is not clear from the meaning of its individual words and which must be learnt as a whole unit ; , give way, a change of heart, be hard put to it
idiosyncrasy n. person's particular way of thinking, behaving, etc that is clearly different from that of others
idolize To regard with inordinate love or admiration.
ignoble adj. not honourable in character or purpose; shameful
ignominious adj. shameful or humiliating; causing disgrace
Iliad A Greek epic poem describing scenes from the siege of Troy.
illegal adj. against the law; not legal ;
illegible adj. difficult or impossible to read; not legible
illegitimate adj. born of parents not married to each other; not legitimate by birth
illiberal adj. nottolerant; narrow-minded
illicit adj. not allowed by law; illegal
illimitable infinite
illiterate adj. not able to read or write
ill-natured adj. bad-tempered; unkind
illogical adj. without reason or logic; not sensible
illuminant That which may be used to produce light.
illuminate v. provide with light
illumine To make bright or clear.
illusion n. false idea, belief or impression; delusion
illusive adjs. based on illusion; deceptive
illusory based on or producing illusion:DECEPTIVE
imaginable adj. that can be imagined
imaginary adj. existing only in the mind or imagination; not real
imbibe v. drink (sth, esp alcohol)
imbroglio n. complicated, confused or embarrassing situation, esp a political or an emotional one ,
imbrue drench, stain, especially with blood
imitation n. thing produced as a copy of the real thing
immaculate adj. perfectly clean and tidy; spotless
immaterial adj. ~ not important; irrelevant
immature adj. not sensible in behaviour or in controlling one's feelings; less mature than one would expect
immeasurable adj. that cannot be measured, esp because of largeness in size or extent
immense adj. extremely large
immerse v. ~ sth put sth under the surface of a liquid
immersion n. immersing; being immersed ;
immigrant n. person who has come to live permanently in a foreign country
immigrate v. ~ enter a foreign country in order to live there permanently
imminence the state of being imminent and liable to happen soon
imminent adj. about to happen; likely to happen very soon
immiscible Separating, as oil and water.
immoral adj. not following accepted standards of morality; not moral
immortalize To cause to last or to be known or remembered throughout a great or indefinite length of time.
immovable adj. that cannot be moved; impossible to move; fixed
immune adj. ~ that cannot be harmed by a disease or illness, either because of inoculation or through natural resistance
immutable adj. that cannot be changed; that will never change
impair v. weaken or damage
impalpable adj. that cannot be touched or felt physically
impartial adj. not favouring one person or thing more than another; fair or neutral
impassable adj. impossible to travel on or over
impassible Not moved or affected by feeling.
impassive adj. showing no sign of feeling
impatience Unwillingness to brook delays or wait the natural course of things.
impeccable adj. free from mistakes; excellent or faultless
impecunious adj. having little or no money
impede v. hinder or obstruct the progress or movement of
impel v. ~ sb (to sth) force or urge sb to do sth
impend to be about to occur
imperative adj. very urgent or important; needing immediateattention
imperceptible adj. that cannot be noticed or felt because so small, slight or gradual
imperil v. (fml ) put (sb/sth) in danger; endanger
imperious adj. proud and arrogant; domineering; expecting obedience
impermissible adj. not allowed or permitted
impersonal adj. not influenced by, showing or involving human feelings
impersonate v. pretend to be in order to entertain others
impertinence Rudeness.
imperturbable adj. not easily troubled or worried; calm
impervious adj. ~ not allowing water, gas, etc to pass through
impetuosity Rashness.
impetuous adj. acting or done quickly and with little thought or care; rash or impulsive
impetus n. ~ thing that encourages a process to develop more quickly
impiety n. lack of respect, esp for God and religion ,
impious adj. showing a lack of respect, esp for God and religion; not pious ,
implausible adj. unlikely to be true; not convincing
implicate v. ~ sb show that sb is involved in sth, esp a crime
implicit adj. ~ implied, but not expressed directly; not explicit
imply v. suggest (sth) indirectly rather than state it directly; hint
impolitic adj. not wise; not politic
importation The act or practice of bringing from one country into another.
importunate adj. persistent, esp in making requests or demands
importune v. ~ sb (for sth) ask sb persistently (for sth), usu in an annoying manner; beg or demand insistently
impotent adj. unable to take effective action; powerless or helpless
impoverish v. make poor
impracticable adj. impossible to put into practice; not practicable
impregnable adj. so strong and well-constructed that it cannot be entered orcaptured
impregnate v. ~ sth cause (one substance) to be filled in every part with another substance; saturate sth
impromptu adj. adv without preparation, rehearsal or thought in advance
improper adj. wrong or incorrect
impropriety n. indecent or unsuitable behaviour; dishonest practice
improvident adj. not preparing for future needs; wasteful
improvise v. compose or play (music), speak or act without previous preparation
imprudent adj. not wise or discreet; not prudent
impudence n. being impudent; impudent behaviour or speech
impugn v. express doubts about (sth)
impulsion n. ~ (fml ) strong urge (to do sth)
impulsive adj. marked by sudden action that is undertaken without careful thought
impunity n. with impunity with freedom from punishment or injury
impure adj. morally wrong, esp in one's sexual behaviour
impute v. ~ sth to sb/sthput the responsibility for sth on sb/sth; attributesth to sb/sth ;
inaccessible adj. ~ very difficult or impossible to reach, approach, or be contacted (by sb); not accessible
inaccurate adj. having errors; not correct or accurate
inactive adj. not active; idle
inadequate adj. not sufficient or enough; not good enough for a particular purpose
inadmissible adj. that cannotbe allowed or admitted, esp in a court of law
inadvertent adj. done without thinking or not deliberately
inadvisable adj. unwise; not sensible
inane adj. without meaning; silly or stupid
inanimate adj. not alive, esp in the way that humans and animals are
inapt adj. not relevant, appropriate or useful
inarticulate adj. unable to express one's words, ideas or feelings clearly
inaudible adj. not loud enough to be heard; not audible
inborn adj. existing in a person or animal from birth; natural; innate
inbred adj. natural; innate
incandescence The state of being white or glowing with heat.
incandescent adj. glowing or shining when heated
incapacitate v. ~ sb make sb unable (to do sth); weaken or disable sb
incapacity n. ~ ~ (for sth/doing sth) lack of ability and necessary strength (to do sth); weakness or inability
incarcerate v. ~ sb (fml ) put sb in prison
incendiary adj. designed to set buildings, etc on fire
incentive n. ~ thing that encourages sb to do sth; stimulus
inception n. start or beginning of sth
inceptive Beginning.
incessant adj. not stopping; continual
inchmeal Piecemeal.
inchoate adj. just begun and therefore not fully formed or developed
inchoative That which begins, or expresses beginning.
incidence n. ~ of sth extent to which sth happens or has an effect
incident n. event or happening,often of minor importance
incidentally adv. by the way
incinerate v. destroy completely by burning; burn to ashes ;
incipience beginning to exist or to be apparent
incipient adj. in its early stages; beginning to happen
incisor n. one of the eight sharp cutting teeth at the front of the mouth
incite v. ~ sb urge or persuade sb to do sth by making him very angry or excited
incoercible Incapable of being forced, constrained, or compelled.
incoherence Want of connection, or agreement, as of parts or ideas in thought, speech, etc.
incoherent adj. not clear or logical
incombustible adj. that cannot be burnt
incomparable adj. too good, great, etc to have an equal; beyond comparison
incompatible adj. ~ not able to live or work happily with sb
incompetence n. lack of skill or ability to do a task successfully
incompetent adj. nothaving or showing the necessary skills to do sth successfully
incomplete adj. not having all its parts; not complete
incomprehensible adj. that cannot be understood; not comprehensible
incompressible adj. that cannot be compressed; unyielding
inconceivable adj. very difficult to believe
incongruous adj. strange because not in harmony with the surrounding features; out of place
inconsequential adj. trivial or irrelevant; not important
inconsiderable adj. small in size or value; not worth considering
inconsistent adj. ~ not in harmony (with sth); containing parts that do not agree with one another
inconstant adj. (of people) having feelings and intentions that change often; not faithful
incontrovertible adj. so obvious and certain that it cannot be disputed or denied
inconvenient adj. causing trouble, difficulty or discomfort; awkward
indefensible adj. that cannot be defended, justified or excused
indelible adj. that cannot be rubbed out or removed
indescribable adj. too bad or good to be described
indestructible adj. that cannot be destroyed
indicant That which points out.
indicator n. person or thing that points out or gives information
indict v. ~ sb (law ) accuse sb officially (of sth); charge sb
indigence n. poverty
indigenous adj. ~ (fml ) belonging naturally (to a place); native
indigent adj. poor
indigestible adj. difficultor impossible to digest
indigestion n. difficulty in digesting food
indignant adj. ~ (at/over/about sth) angry and scornful, esp at injustice or because of undeserved blame, etc
indignity n. rude or unworthy treatment causing shame or loss of respect
indiscernible adj. that cannot be discerned
indiscreet adj. too open in what one says or does; lacking tact or caution
indiscriminate adj. ~ (in sth) acting without careful judgement
indispensable Necessary or requisite for the purpose.
indistinct adj. not distinct; vague
indivisible adj. that cannot be divided
indolence laziness
indolent adj. lazy; inactive ;
indomitable adj. that cannot be subdued or defeated; unyielding
induct v. ~ sb install sb formally or with ceremony in a position or an office; admit sb as a member of sth
indulgence n. state of being allowed whatever one wants
indulgent adj. inclined to indulge
inebriate adj. n habitually drunk (person)
inedible adj. not suitable to be eaten
ineffable adj. too great to be described in words
inefficiency That which does not accomplish an intended purpose.
inefficient adj. not producing adequate results; wasteful
ineligible adj. ~ not having the appropriate or necessary qualifications (for sth)
inept adj. ~ (at sth/doing sth) completely unskilful (at sth)
inert adj. without power to move or act
inestimable adj. too great, precious, etc to be estimated
inevitable adj. that cannot be avoided; that is sure to happen
inexcusable adj. too bad to be excused
inexhaustible adj. that will always continue; that cannot be used up
inexorable adj. continuing unstoppably; relentless
inexpedient adj. not serving a useful purpose; unwise; not expedient
inexpensive adj. low priced; not expensive ;
inexperience n. ~ lack of experience
inexplicable adj. that cannot be explained
inexpressible adj. too great to be expressed in words
infallible adj. incapable of making mistakes or doing wrong
infamous adj. ~ well-known as being wicked or immoral; notorious
infamy n. infamousbehaviour; wickedness ;
inference n. process of inferring
infernal adj. of hell
infest To be present in such numbers as to be a source of annoyance, trouble, or danger.
infidel n. person with no belief in a religion, esp in what is considered to be the true religion ,
infidelity n. (act of) disloyalty or unfaithfulness, esp adultery
infinite adj. without limits; endless
infinity n. state of being endless or boundless; infinite nature
infirm adj. physically weak
infirmary n. hospital
infirmity n. weakness
inflammable adj. that can be set on fire
inflammation n. condition in which a part of the body is red, swollen and sore or itchy, esp because of infection
inflexible adj. that cannot be bent or turned
influence n. ~ power to produce an effect; action of natural forces
influential adj. ~ having influence; persuasive
influx n. ~ arrival of people or things, esp suddenly and in large numbers or quantities
infrequence Rareness.
infrequent adj. not frequent; rare
infringe v. break (a rule, an agreement, etc)
infuse v. ~ sth into sb/sth; ~ sb/sth with sth put into sb/sth; fill sb/sth with (a quality) ;
infusion n. ~ of sth infusing a quality or being infused into sb/sth
ingenious adj. ~ (at sth/doing sth) (of a person) clever at finding new or simple solutions for complex problems
ingenuity n. cleverness and originality in solving problems
ingenuous adj. not attempting to deceive or conceal; open; innocent
inglorious adj. shameful; ignominious
ingratiate to become popular with
ingratitude n. lack of gratitude
ingredient n. any of the foods that are combined to make a particular dish
inherence The state of being permanently existing in something.
inherent adj. ~ existing as a natural or permanent feature or quality of sb/sth
inhibit v. ~ sb prevent sb from doing sth that should be natural or easy to do
inhospitable adj. (of people) not giving a friendly or polite welcome to guests
inhuman adj. lacking normal human qualities of kindness, pity, etc; extremely cruel or brutal
inhume To place in the earth, as a dead body.
inimical adj. ~ (fml ) unfriendly; hostile
iniquity n. (rhet ) wickedness and unjustness
initiate v. put (a scheme, etc) into operation; cause (sth) to begin
inject v. ~ sth ~ sb/sth (with sth) force (a drug or other liquid) into sb/sth with a syringe or similar implement
injunction n. official order, esp a written order from a lawcourt, demanding that sth shall or shall not be done
inkling n. ~ slight knowledge (of sth secret or not previously known); hint
inland adj. situated in the interior of a country, not by the sea or by a frontier
inlet n. strip of water extending into the land from the sea or a lake, or between islands ,
inmost adj. most inward; furthest from the surface
innocuous adj. causing no harm
innovate v. make changes; introduce new things
innuendo n. (derog ) indirect reference (usu suggesting sth bad or discreditable about sb)
innumerable adj. too many to be counted
inoffensive adj. not giving offence; not objectionable
inopportune adj. not appropriate or convenient
inquire v. ~ sth (of sb) ask to be told sth (by sb)
inquisition n. the Inquisitionorganization appointed by the Roman Catholic Church to suppress heresy (esp from the 15th to the 17th century) , 1517
inquisitive adj. fond of inquiring into other people's affairs
inquisitor n. investigator, esp an officer of the Inquisition
inroad n. ~ (into sth) sudden attack on another's territory; raid
insatiable adj. ~ that cannot be satisfied; very greedy
inscribe v. ~ A ~ B (with A) write (words, one's name, etc) on or in sth, esp as a formal or permanent record
inscrutable adj. that cannot be understood or known; mysterious
insecure adj. not secure or safe; not providing good support; that cannot be relied on
insensible adj. unconscious as the result of injury, illness, etc
insentient Lacking the power of feeling or perceiving.
inseparable adj. ~ that cannot be separated
insidious adj. spreading or acting gradually and unnoticed but with harmful effects
insight n. ~ (approv ) ability to see into the true nature (of sth); deep understanding
insignificance Lack of import or of importance.
insignificant adj. having little or no value, use, meaning or importance
insinuate v. ~ sth suggest sth (to sb) unpleasantly and indirectly
insipid adj. having almost no taste or flavour
insistence n. ~ (about/on sth); ~ (that...)
insistent adj. ~ ~ (that...) tending to insist; not allowing refusal or opposition
insolence n. ~ being insolent
insolent adj. ~ extremely rude, esp in expressing contempt
insomnia n. inability to sleep
inspector n. official who inspects eg schools, factories, mines
instance n. ~ particular occurrence of sth that happens generally or several times; example; case
instant adj. coming or happening at once
instantaneous adj. happening or done immediately
instigate v. cause to begin or happen; initiate
instill to impart gradually
instructive adj. giving much useful information
insufficiency a lack of competence ; (pathology) inability of a bodily part or organ to function normally
insufficient adj. ~ not sufficient
insular adj. of an island
insulate v. ~ (from/against sth) (with sth) protect (sth) by covering it with a material that prevents sth (esp heat, electricity or sound) from passing through
insuperable adj. (of difficulties) that cannot be overcome
insuppressible Incapable of being concealed.
insurgence Uprising.
insurgent adj. in revolt; rebellious
insurrection n. sudden,usu violent, action taken by the population to try to remove the government
intangible adj. that cannot be clearly or definitely understood or grasped; indefinable
integrity n. quality of being honest and morally upright
intellect n. power of the mind to reason and acquire knowledge
intellectual adj. of the intellect
intelligence n. power of learning, understanding and reasoning; mental ability
intelligible adj. that can be understood
intemperance Immoderate action or indulgence, as of the appetites.
intension The act of stringing or stretching, or state of being strained.
intensive adj. concentrating all one's effort on a specific area
intention n. ~ (of doing sth/that...) that which one proposes or plans to do
interact v. ~ act or have an effect on each other
intercede v. ~ (with sb) (for/on behalf of sb) plead (with sb) to be merciful (to sb)
intercept v. stop or catch before he or it can reach a destination
intercession n. interceding
interdict v. (esp law ) prohibit (an action); forbid the use of (sth) ;
interim n. in the interimduring the time that comes between; meantime
interlocutor n. person taking part in a conversation or discussion
interlude n. short period of time separating the parts of a play, film, etc; interval
intermediate adj. ~ situated or coming between two people, things, etc in time, space, degree, etc
interminable adj. going on too long, and usu therefore annoying or boring
intermission n. period of time during which sth stops before continuing; interval; pause
intermit To cause to cease temporarily.
intermittent adj. continually stopping and then starting again; not constant
interpolation n. interpolating or being interpolated
interpose v. ~ sb/sth (between A and B) place sb/sth between others
interposition n. interposing or being interposed
interpreter n. person who gives a simultaneous translation of words spoken in another language
interrogate v. ~ sb question sb aggressively or closely and for a long time
interrogative adj. asking or seeming to ask a question; inquiring
interrogatory adj. interrogative(1)
interrupt v. break the continuity of temporarily
intersect v. divide by going across it
intervale A low tract of land between hills, especially along a river.
intervene v. (of time) come or be between
intestacy n. condition of being intestate
intestate adj. not having made a will before death occurs
intestine n. long tube in the body which helps to digest food and carries it from the stomach to the anus
intimacy n. state of being intimate; close friendship or relationship ;
intimidate v. ~ sb frighten sb (in order to make him do sth)
intolerable adj. too bad to be borne or endured
intolerance Inability or unwillingness to bear or endure.
intolerant adj. not tolerant
intoxicant n. intoxicating substance, esp alcoholic drink
intoxicate To make drunk.
intracellular Occurring or situated within a cell.
intramural adj. intended for full-time students living within a college
intrepid adj. fearless; brave
intricacy n. quality of being inticate
intricate adj. made up of many small parts put together in a complex way, and therefore difficult to follow or understand
intrigue v. ~ (against sb) make and carry out secret plans or plots to do sth bad
intrinsic adj. belonging naturally; existing within, not coming from outside
introductory adj. acting as an introduction
introgression Entrance.
intromit To insert.
introspection n. introspecting
introversion n. state of being introverted
introvert n. person who is more interested in his own thoughts and feelings than in things outside himself, and is often shy and unwilling to speak or join in activities with others
intrude v. ~ on/upon sb/sth; ~ (oneself/sth) into sth (esp fml ) put (oneself/sth) into a place or situation where one/it is unwelcome or unsuitable
intrusion n. ~ intruding
intuition n. (power of) understanding things (eg a situation, sb's feelings) immediately, without the need for conscious reasoning or study
inundate v. ~ sth(fml ) cover sth with water by overflowing; flood
inundation n. (instance of) flooding
inure to accustom to accept something undesirable
invalid adj. not properly based or able to be upheld by reasoning
invalidate v. make invalid
invaluable adj. ~ of value too high to be measured; extremely valuable
invariable adj. never changing; always the same; constant
invasion n. invading or being invaded
invective n. violent attack in words; abusive language
inveigh v. ~ against sb/sth attack sb or sth violently in words
inventive adj. of or for invention
inverse adj. reversed in position, direction or relation
inversion n. inverting or being inverted; instance of this
invert v. put upside down or in the opposite order, position or arrangement
investor n. person who invests money
inveterate adj. (of bad feelings, habits, etc) that have lasted a long time and seem likely to continue
invidious adj. likely to cause resentment or unpopularity
invigorate v. make feel more lively and healthy
invincible adj. too strong to be overcome or defeated
inviolable adj. that must not be violated or dishonoured
invoke v. use (sth) as a reason for one's action
involuntary adj. done without intention; done unconsciously
involution Complication.
involve v. make necessary as a condition or result; entail
invulnerable adj. ~ that cannot be wounded, hurt or damaged by attack
inwardly adv. in mind or spirit
iota n. the Greek letter I, i I, i
irascible adj. (of a person) easily made angry
irate adj. angry
ire n. anger
iridescence a lustrous rainbowlike play of color caused by differential refraction of light waves (as from an oil slick, soap bubble, or fish scales) that tends to change as the angle of view changes
iridescent adj. showing colours like those of the rainbow
irk v. be tiresome to (sb); annoy
irksome adj. tiresome; annoying
irony n. expression of one's meaning by saying the direct opposite of one's thoughts in order to be emphatic, amusing, sarcastic, etc
irradiance Luster.
irradiate v. ~ sth (with sth) send rays of light upon sth; subject sth to sunlight, ultraviolet rays or radioactivity ;
irrational adj. not guided by reason; illogical or absurd
irreducible adj. that cannot be reduced or made smaller
irrefragable not to be disproved; indisputable
irrelevant adj. ~ not connected (with sth); not relevant (to sth)
irreligious adj. feeling no interest in, or feeling hostile to, religion; irreverent
irreparable adj. that cannot be put right, restored or repaired
irrepressible adj. that cannot be held back or controlled
irresistible adj. too strong tobe resisted
irresponsible adj. not showing a proper sense of responsibility
irreverence The quality showing or expressing a deficiency of veneration, especially for sacred things.
irreverent adj. feeling or showing no respect for sacred things
irreversible adj. that cannot be reversed or revoked; unalterable
irrigate v. supply with water (by means of streams, reservoirs, channels, pipes, etc)
irritable adj. easily annoyed or made angry; touchy ;
irritant adj. causing irritation; irritating
irritate v. make angry, annoyed or impatient
irrupt to enter forcibly or suddenly
isle n. (esp in poetry and proper names ) island
islet n. small island
isobar n. line on a map, esp a weather chart, joining places with the same atmospheric pressure at a particular time
isochronous Relating to or denoting equal intervals of time.
isolate v. ~sb/sth put or keep sb/sth entirely apart from other people or things; separate sb/sth ;
isothermal Having or marking equality of temperature.
itinerant adj. travelling from place to place
itinerary n. plan for, or record of, a journey; route
itinerate to travel from place to place, to peregrinate

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