John's Dictionary of Words You Should Know
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A ~ means it is one of the 110 hardest words on the SAT.
-I-
iconoclast-one known for attacking settled beliefs
~idiosyncrasy-any personal peculiarity, eccentricity
immutable-unchanging
impartial-treating all equally, unbiased
impetuous-done on the spur of the moment
impious-rude, disrespectful
implacable-incapable of being calmed, relentless
impugn-to challenge the accuracy of something
impromptu-done on the spur of the moment
impulsive-done on first impulse, without careful thought
inauspicious-not favorable
~incandescent-giving off light, brilliantly shining
~incantation-use of spells or verbal charms spoken as part of a magical ritual
incessant-never-ceasing, endless
~incipient-in the early stages, just beginning, embryonic
~incontrovertible-cannot be disproved
incorporeal-without material form or substance
incorrigible-incapable of being reformed
indefatigable-incapable of being fatigued, having great stamina
~indelicate-lacking a sensitivity for the feelings of others
~indiscreet-an action marked by a lack of decorum, tasteless action
indolent-exhausted and lacking energy
~indomitable-incapable of being subdued, unconquerable
inebriated-drunk
~ineffable-incapable of being expressed, indescribable
infidelity-unfaithfulness
injunction-a court order requiring or prohibiting an action
~innate-present in an individual from birth
insatiable-incapable of being satisfied
~insipid-without flavor, tasteless, dull
~insolent-disrespectful in speech or conduct, haughty
~insuperable-something incapable of being overcome
intractable-stubborn
intransigent-stubborn
intrepid-having no fear
inviolable-cannot be violated, secure
~irrevocable-not possible to be revoked, unable to be called back
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