| Term | Definition |
| inadvertently | unintentionally; by oversight; carelessly |
| inchoate | recently begun; rudimentary; elementary |
| incongruity | lack of harmony; absurdity |
| inconsequential | insignificant; unimportant |
| incorporate | introduce something into a larger whole; combine; unite |
| indeterminate | uncertain; not clearly fixed; indefinite |
| indigence | poverty |
| indolent | lazy |
| inert | inactive; lacking power to move |
| ingenuous | naive and trusting; young; unsophisticated |
| inherent | firmly established by nature or habit |
| innocuous | harmless |
| insensible | unconscious; unresponsive |
| insinuate | hint; imply; creep in |
| insipid | lacking in flavor; dull |
| insularity | narrow-mindedness; isolation |
| intractable | unruly; stubborn; unyielding |
| intransigence | refusal of any compromise; stubbornness |
| inundate | overwhelm; flood; submerge |
| inured | accustomed; hardened |
| invective | abuse |
| irascible | irritable; easily angered |
| irresolute | uncertain how to act; weak |
| itinerary | plan of a trip |
| laconic | brief and to the point |
| lassitude | languor; weariness |
| latent | potential but undeveloped; dormant; hidden |
| laud | praise |
| lethargic | drowsy; dull |
| levee | earthen or stone embankment to prevent flooding |
| levity | lack of seriousness or steadiness; frivolity |
| log | record of a voyage or flight; record of day-to-day activities |
| loquacious | talkative |
| lucid | easily understood; clear; intelligible |
| luminous | shining; issuing light |
| magnanimity | generosity |
| malingerer | one who feigns illness to escape duty |
| malleable | capable of being shaped by pounding; impressionable |
| maverick | rebel; nonconformist |
| mendacious | lying; habitually dishonest |
| metamorphosis | change of form |
| meticulous | excessively careful; painstaking; scrupulous |
| misanthrope | one who hates mankind |
| mitigate | lessen in intensity; moderate; appease |
| mollify | soothe |
| morose | ill-humored; sullen; melancholy |
| mundane | worldly as opposed to spiritual; everyday |
| negate | cancel out; nullify; deny |
| neophyte | recent convert; beginner |
| obdurate | stubborn |
| obsequious | slavishly attentive; servile; sycophantic |
| obviate | make unnecessary; get rid of |
| occlude | shut; close |
| officious | meddlesome; excessively pushy in offering one's services |
| onerous | burdensome |
| opprobium | infamy; vilification |
| elicit | draw out by discussion |
| embellish | adorn; ornament; enhance, as a story |
| empirical | base on experience |
| emulate | imitate; rival |
| endemic | prevailing among a specific group of people or an area |
| enervate | weaken |
| engender | cause; produce |
| enhance | increase; improve |
| ephemeral | short-lived; fleeting |
| equanimity | calmness of temperament; composure |
| equivocate | lie, mislead; attempt to conceal the truth |
| erudite | learned; scholarly |
| esoteric | hard to understand; known only to the chosen few |
| eulogy | expression of praise, often on the occasion of someone's death |
| euphemism | mild expression in place of an unpleasant one |
| exacerbate | worsen; embitter |
| exculpate | clear from blame |
| exigency | urgent situation; pressing needs or demands; state of requiring immediate attention |
| extrapolation | projection; superfluous |
| facetious | joking (often inappropriately); humorous |
| facilitate | help bring about; make less difficult |
| fallacious | false; misleading |
| fatuous | brainless; inane; foolish, yet smug |
| fawning | trying to please by behaving obsequiously, flattering or cringing |
| felicitous | apt; suitably expressed; well chosen |
| fervor | glowing ardor; intensity of feeling |
| flag | droop; grow feeble |
| fledgling | inexperienced |
| flout | reject; mock; show contempt for |
| foment | stir up; instigate |
| forestall | prevent by taking action in advance |
| frugality | thrift; economy |
| futile | useless; hopeless; ineffectual |
| gainsay | deny |
| garrulous | loquacious; wordy; talkative |
| goad | urge on |
| gouge | overcharge |
| grandiloquent | pompous; bombastic; using high-sounding language |
| gregarious | sociable |
| guileless | without deceit |
| gullible | easily deceived |
| harangue | long, passionate, and vehement speech |
| homogenous | of the same kind |
| hyperbole | exaggeration; overstatement |
| iconoclast | attacking cherished traditions |
| idolatry | worship of idols; excessive admiration |
| immutable | unchangeable |
| impair | injure; hurt |
| impassive | without feeling; imperturbable; stoical |
| impede | hinder, block |
| impermeable | impervious; not permitting passage through its substance |
| imperturbable | calm; placid |
| impervious | impenetrable; incapable of being damaged or distressed |
| implacable | incapable of being pacified |
| implicit | understood but not stated |
| implode | burst inward |