SAT词汇中以字母I开头的词汇较多，新航道小编整理SAT高频词汇之字母I开头词汇，供大家参考。

　　iconoclast (n.) one who attacks common beliefs or institutions (Jane goes to one protest

　　after another, but she seems to be an iconoclast rather than an activist with a

　　progressive agenda.)

　　idiosyncratic (adj.) peculiar to one person; highly individualized (I know you had

　　trouble with the last test, but because your mistakes were highly idiosyncratic, I’m

　　going to deny your request that the class be given a new test.)

　　idolatrous (adj.) excessively worshipping one object or person (Xena’s idolatrous

　　fawning over the band—following them on tour, starting their fan club, filming

　　their documentary—is really beginning to get on my nerves.)

　　ignominious (adj.) humiliating, disgracing (It was really ignominious to be kicked out of

　　the dorm for having an illegal gas stove in my room.)

　　illicit (adj.) forbidden, not permitted (The fourth-grader learned many illicit words

　　from a pamphlet that was being passed around school.)

　　immerse (v.) to absorb, deeply involve, engross (After breaking up with her boyfriend,

　　Nancy decided to immerse herself in her work in order to avoid crying.)

　　immutable (adj.) not changeable (The laws of physics are immutable and constant.)

　　impassive (adj.) stoic, not susceptible to suffering (Stop being so impassive; it’s healthy

　　to cry every now and then.)

　　impeccable (adj.) exemplary, flawless (If your grades were as impeccable as your sister’s,

　　then you too would receive a car for a graduation present.)

　　impecunious (adj.) poor (“I fear he’s too impecunious to take me out tonight,” the

　　bratty girl whined.)

　　imperative 1. (adj.) necessary, pressing (It is imperative that you have these folders

　　organized by midday.) 2. (n.) a rule, command, or order (Her imperative to have

　　the folders organized by midday was perceived as ridiculous by the others.)

　　imperious (adj.) commanding, domineering (The imperious nature of your manner led

　　me to dislike you at once.)

　　impertinent (adj.) rude, insolent (Most of your comments are so impertinent that I don’t

　　wish to dignify them with an answer.)

　　impervious (adj.) impenetrable, incapable of being affected (Because of their thick layer

　　of fur, many seals are almost impervious to the cold.)

　　impetuous (adj.) rash; hastily done (Hilda’s hasty slaying of the king was an impetuous,

　　thoughtless action.)

　　impinge 1. (v.) to impact, affect, make an impression (The hail impinged the roof,

　　leaving large dents.) 2. (v.) to encroach, infringe (I apologize for impinging upon

　　you like this, but I really need to use your bathroom. Now.)

　　implacable (adj.) incapable of being appeased or mitigated (Watch out: once you shun

　　Grandma’s cooking, she is totally implacable.)

　　implement 1. (n.) an instrument, utensil, tool (Do you have a knife or some other sort of

　　implement that I could use to pry the lid off of this jar?) 2. (v.) to put into effect, to

　　institute (After the first town curfew failed to stop the graffiti problem, the mayor

　　implemented a new policy to use security cameras to catch perpetrators in the act.)

　　implicate (v.) to involve in an incriminating way, incriminate (Even though Tom wasn’t

　　present at the time of the shooting, he was implicated by the evidence suggesting that

　　he had supplied the shooters with guns.)

　　implicit (adj.) understood but not outwardly obvious, implied (I know Professor Smith

　　didn’t actually say not to write from personal experience, but I think such a message

　　was implicit in her instruction to use scholarly sources.)

　　impregnable (adj.) resistant to capture or penetration (Though the invaders used

　　battering rams, catapults, and rain dances, the fortress proved impregnable and

　　resisted all attacks.)

　　impudent (adj.) casually rude, insolent, impertinent (The impudent young man looked

　　the princess up and down and told her she was hot even though she hadn’t asked

　　him.)

　　impute (v.) to ascribe, blame (The CEO imputed the many typos in the letter to his lazy

　　secretary.)

　　inane (adj.) silly and meaningless (Some films are so inane that the psychology of the

　　characters makes absolutely no sense.)

　　inarticulate (adj.) incapable of expressing oneself clearly through speech (Though he

　　spoke for over an hour, the lecturer was completely inarticulate and the students had

　　incarnate 1. (adj.) existing in the flesh, embodied (In the church pageant, I play the role

　　of greed incarnate.) 2. (v.) to give human form to (The alien evaded detection by

　　incarnating himself in a human form.)

　　incendiary 1. (n.) a person who agitates (If we catch the incendiary who screamed

　　“bomb” in the middle of the soccer match, we’re going to put him in jail.) 2. (adj.)

　　inflammatory, causing combustion (Gas and lighter fluid are incendiary materials

　　that should be kept out of hot storage areas.)

　　incessant (adj.) unending (We wanted to go outside and play, but the incessant rain kept

　　us indoors for two days.)

　　inchoate (adj.) unformed or formless, in a beginning stage (The country’s government

　　is still inchoate and, because it has no great tradition, quite unstable.)

　　incisive (adj.) clear, sharp, direct (The discussion wasn’t going anywhere until her

　　incisive comment allowed everyone to see what the true issues were.)

　　inclination (n.) a tendency, propensity (Sarah has an inclination to see every foreign film

　　she hears about, even when she’s sure that she won’t like it.)

　　incontrovertible (adj.) indisputable (Only stubborn Tina would attempt to disprove the

　　incontrovertible laws of physics.)

　　incorrigible (adj.) incapable of correction, delinquent (You can buy Grandma nicotine

　　gum all you want, but I think that after sixty-five years of smoking she’s

　　incorrigible.)

　　increment (n.) an enlargement; the process of increasing(The workmen made the wall

　　longer, increment by increment.)

　　incumbent 1. (n.) one who holds an office (The incumbent senator is already serving his

　　fifth term.) 2. (adj.) obligatory (It is incumbent upon this organization to offer aid to

　　all who seek it.)

　　indefatigable (adj.) incapable of defeat, failure, decay (Even after traveling 62 miles, the

　　indefatigable runner kept on moving.)

　　indigenous (adj.) originating in a region (Some fear that these plants, which are not

　　indigenous to the region, may choke out the vegetation that is native to the area.)

　　indigent (adj.) very poor, impoverished (I would rather donate money to help the

　　indigent population than to the park sculpture fund.)

　　indignation (n.) anger sparked by something unjust or unfair (I resigned from the

　　sorority because of my indignation at its hazing of new members.)

　　indolent (adj.) lazy (Why should my indolent children, who can’t even pick themselves

　　up off the couch to pour their own juice, be rewarded with a trip to the mall?)

　　indomitable (adj.) not capable of being conquered (To be honest, Jim, my indomitable

　　nature means I could never take orders from anyone, and especially not from a jerk

　　like you.)

　　induce (v.) to bring about, stimulate (Who knew that our decision to boycott school

　　lunch would induce a huge riot?)

　　ineffable (adj.) unspeakable, incapable of being expressed through words (It is said

　　that the experience of playing with a dolphin is ineffable and can only be understood

　　through direct encounter.)

　　inept (adj.) not suitable or capable, unqualified (She proved how inept she was when

　　she forgot three orders and spilled a beer in a customer’s lap.)

　　inexorable (adj.) incapable of being persuaded or placated (Although I begged for

　　hours, Mom was inexorable and refused to let me stay out all night after the prom.)

　　inextricable (adj.) hopelessly tangled or entangled (Unless I look at the solution

　　manual, I have no way of solving this inextricable problem.)

　　infamy (n.) notoriety, extreme ill repute (The infamy of his crime will not lessen as the

　　decades pass.)

　　infusion (n.) an injection of one substance into another; the permeation of one

　　substance by another (The infusion of Eastern religion into Western philosophy

　　created interesting new schools of thought.)

　　ingenious (adj.) clever, resourceful (Her ingenious use of walnuts instead of the peanuts

　　called for by the recipe was lauded by the other garden club members who found her

　　cake delicious.)

　　ingenuous (adj.) not devious; innocent and candid (He must have writers, but his

　　speeches seem so ingenuous it’s hard to believe he’s not speaking from his own heart.)

　　inhibit (v.) to prevent, restrain, stop (When I told you I needed the car last night, I

　　certainly never meant to inhibit you from going out.)

　　inimical (adj.) hostile, enemylike (I don’t see how I could ever work for a company that

　　was so cold and inimical to me during my interviews.)

　　iniquity (n.) wickedness or sin (“Your iniquity,” said the priest to the practical jokester,

　　“will be forgiven.”)

　　injunction (n.) an order of official warning (After his house was toilet-papered for the

　　fifth time, the mayor issued an injunction against anyone younger than 21 buying

　　toilet paper.)

　　innate (adj.) inborn, native, inherent (His incredible athletic talent is innate, he never

　　trains, lifts weights, or practices.)

　　innocuous (adj.) harmless, inoffensive (In spite of their innocuous appearance, these

　　mushrooms are actually quite poisonous.)

　　innovate (v.) to do something in an unprecedented way (Because of the stiff

　　competition, the company knew it needed to pour a lot of energy into innovating

　　new and better products.)

　　innuendo (n.) an insinuation (During the debate, the politician made several innuendos

　　about the sexual activities of his opponent.)

　　inoculate (v.) to introduce a microorganism, serum, or vaccine into an organism in

　　order to increase immunity to illness; to vaccinate (I’ve feared needles ever since I

　　was inoculated against 37 diseases at age one; but I have also never been sick.)

　　inquisitor (n.) one who inquires, especially in a hostile manner (The inquisitor was

　　instructed to knock on every door in town in order to find the fugitive.)

　　insatiable (adj.) incapable of being satisfied (My insatiable appetite for melons can be a

　　real problem in the winter.)

　　insidious (adj.) appealing but imperceptibly harmful, seductive (Lisa’s insidious

　　chocolate cake tastes so good but makes you feel so sick later on!)

　　insinuate (v.) to suggest indirectly or subtly (I wish Luke and Spencer would stop

　　insinuating that my perfect report card is the result of anything other than my

　　superior intelligence and good work habits.)

　　insipid (adj.) dull, boring (The play was so insipid, I fell asleep halfway through.)

　　insolent (adj.) rude, arrogant, overbearing (That celebrity is so insolent, making fun of

　　his fans right to their faces.)

　　instigate (v.) to urge, goad (The demagogue instigated the crowd into a fury by telling

　　them that they had been cheated by the federal government.)

　　insular (adj.) separated and narrow-minded; tight-knit, closed off (Because of the

　　sensitive nature of their jobs, those who work for the CIA must remain insular and

　　generally only spend time with each other.)

　　insurgent (n.) one who rebels (The insurgent snuck into and defaced a different

　　classroom each night until the administration agreed to meet his demands.)

　　integral (adj.) necessary for completeness (Without the integral ingredient of flour, you

　　wouldn’t be able to make bread.)

　　interject (v.) to insert between other things (During our conversation, the cab driver

　　occasionally interjected his opinion.)

　　interlocutor (n.) someone who participates in a dialogue or conversation (When the

　　officials could not come to an agreement over the correct cover of the flags, the prime

　　minister acted as an interlocutor.)

　　interminable (adj.) without possibility of end (The fact that biology lectures came just

　　before lunch made them seem interminable.)

　　intimation (n.) an indirect suggestion (Mr. Brinford’s intimation that he would soon pass

　　away occurred when he began to discuss how to distribute his belongings among his

　　children.)

　　intractable (adj.) difficult to manipulate, unmanageable (There was no end in sight to

　　the intractable conflict between the warring countries.)

　　intransigent (adj.) refusing to compromise, often on an extreme opinion (The

　　intransigent child said he would have 12 scoops of ice cream, or he would bang his

　　head against the wall until his mother fainted from fear.)

　　intrepid (adj.) brave in the face of danger (After scaling a live volcano prior to its

　　eruption, the explorer was praised for his intrepid attitude.)

　　inundate (v.) to flood with abundance (Because I am the star of a new sitcom, my fans

　　are sure to inundate me with fan mail and praise.)

　　inure (v.) to cause someone or something to become accustomed to a situation (Twenty

　　years in the salt mines inured the man to the discomforts of dirt and grime.)

　　invective (n.) an angry verbal attack (My mother’s irrational invective against the way I

　　dress only made me decide to dye my hair green.)

　　inveterate (adj.) stubbornly established by habit (I’m the first to admit that I’m an

　　inveterate coffee drinker—I drink four cups a day.)

　　inviolable (adj.) secure from assault (Nobody was ever able to break into Batman’s

　　inviolable Batcave.)

　　irascible (adj.) easily angered (At the smallest provocation, my irascible cat will begin

　　scratching and clawing.)

　　iridescent (adj.) showing rainbow colors (The bride’s large diamond ring was

　　iridescent in the afternoon sun.)

　　irreverence (n.) disrespect (The irreverence displayed by the band that marched

　　through the chapel disturbed many churchgoers.)

　　irrevocable (adj.) incapable of being taken back (The Bill of Rights is an irrevocable

　　part of American law.)

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