inopportune ADJ. /不合时宜的/untimely; poorly chosen. A rock concert is an inopportune setting for a quiet
conversation.
inordinate ADJ. /紊乱的;不受限制的/unrestrained; excessive. She had an inordinate fondness for candy, eating two or
three boxes in a single day.
inquisitor N. /调查者;盘问者/questioner (especially harsh); investigator. Fearing being grilled ruthlessly by the secret
police, Masha faced her inquisitors with trepidation.
insalubrious ADJ. /有害的/unwholesome; not healthful. The mosquito-ridden swamp was an insalubrious place, a
breeding ground for malarial contagion.
insatiable ADJ. /不容易伺候的;贪婪的/not easily satisfied; unquenchable; greedy. David's appetite for oysters was
insatiable: he could easily eat four dozen at a single sitting.
inscrutable ADJ. /不可渗透的;不可理解的，谜/impenetrable; not readily understood; mysterious. Experienced poker
players try to keep their expressions inscrutable, hiding their reactions to the cards behind a so-called "poker face."
insensible ADJ. /迟钝的;硬心肠的/unconscious; unresponsive. Sherry and I are very different; at times when I would be
covered with embarrassment, she seems insensible to shame.
insidious ADJ. /阴险的，奸诈的，狡猾的;鬼鬼祟祟的/treacherous; stealthy; sly. The fifth column is insidious because it
works secretly within our territory for our defeat.
insightful ADJ. /有洞察力的/discerning; perceptive. Sol thought he was very insightful about human behavior, but he
was actually clueless as to why people acted the way they did.
insinuate V. /暗示，含沙舐影;慢慢的夺取，巧妙的迂回(进入)/hint; imply; creep in. When you said I looked robust, did you
mean to insinuate that I'm getting fat?
insipid ADJ. /索然无味的;单调的/lacking in flavor; dull. Flat prose and flat ginger ale are equally insipid: both lack
sparkle.
insolence N. /傲慢/impudent disrespect; haughtiness. How dare you treat me so rudely! The manager will hear of
your insolence. insolent, ADJ.
insolvent ADJ. /破产/bankrupt; unable to repay one's debts. Although young Lord Widgeon was insolvent, he had no
fear of being thrown into debtors' prison, for he was sure that if his creditors pressed him for payment his wealthy parents would repay what he owed. insolvency, N.
insomnia N. /失眠/wakefulness; inability to sleep. He refused to join us in a midnight cup of coffee because he
claimed it gave him insomnia.
instigate V. /驱使;激励，鼓动/urge; start; provoke. Rumors of police corruption led the mayor to instigate an
investigation into the department's activities.
insubordination N. /反抗，不屈/disobedience; rebelliousness. At the slightest hint of insubordination from the sailors
of the Bounty, Captain Bligh had them flogged; finally, they mutinied.
insubstantial ADJ. /无实体的，虚无的;脆弱的，不坚固的/lacking substance; insignificant; frail. His hopes for a career in
acting proved insubstantial; no one would cast him, even in an insubstantial role.
insularity N. /与外界隔绝;僵化;思想狭窄/narrow-mindedness; isolation. The insularity of the islanders manifested itself
in their suspicion of anything foreign. insular, ADJ.
insulated ADJ. /分离;隔离/set apart; isolated. A well-to-do bachelor, James spent his money freely, insulated from the
cares of his friends, who had families to support.
insuperable ADJ. /不可战胜的，不能克服的/insurmountable; unbeatable. Though the odds against their survival seemed
insuperable, the Apollo 13 astronauts reached earth safely.
insurgent ADJ. /造反的，起义的/rebellious. Because the insurgent forces had occupied the capital and had gained
control of the railway lines, several of the war correspondents covering the uprising predicted a rebel victory.
insurmountable ADJ. / 不能克服的， 不能超越的/overwhelming; unbeatable; insuperable. Faced by almost insurmountable obstacles, the members of the underground maintained their courage and will to resist.
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