idyllic: simple, peaceful ignoble: dishonorable, unworthy ignominy: shame, dishonor, or deep disgrace illicit: illegal illimitable: infinite imbue: fill, saturate immaculate: absolutely clean, spotless immolate: offer as a sacrifice immune: shut up in confinement impalpable: intangible, imaginary impassive: without feeling, expressionless imperious: without mercy impediment: stumble-blocking, hindrance impel: force or drive onward impenitent: not repentant imperative: critically important, absolutely necessary imperceptible: undetectable, unnoticeable imperious: arrogant, authoritative impertinent: disrespectful, insolent imperturbable: placid, calm impervious: incapable of being damaged or distressed impetuous: hasty, rash, violent impetus: moving force, stimulus impolitic: not wise imponderable: weightless importunate: demanding, urging imprecation: curse impregnable: invulnerable impropriety: improperness imprudent: injudicious, lacking cautious impugn: accuse, challenge, dispute impunity: freedom from harm or punishment impute: ascribe, attribute inane: senseless, silly inarticulate: faltering, incoherent incandescent: shining with intense heat incense: infuriate, enrage inception: beginning, start incipient: in a early stage, beginning incognito: using an assumed name incoherent: muddled, illogical incommodious: inconvenient, not spacious incontrovertible: not open to question incorporeal: intangible, lacking a material body inculcate: instill, repeat indelible: not able to be erased | indigent: destitute, poor incite: compose, write indolent: lazy indulgent: yielding, humoring, lenient industrious: diligent, hardworking inept: lacking skill inexorable: implacable, relentless infantile: childish infinitesimal: very small infirmity: weakness ingrate: ungrateful person inimical: harmful, unfriendly, detrimental iniquitous: immoral, wicked inkling: hint innocuous: harmless innuendo: hint, suggestion inordinate: excessive, unrestrained insalubrious: unwholesome insatiable: greedy, not easily satisfied insensate: without feeling insidious: sly, treacherous insinuate: imply, hint, creep in insipid: dull, lacking flavor insolence: imprudent, disrespect insubordination: disobedience insuperable: unbeatable insurrection: uprising, rebellion integral: essential, vital interdict: forbid, prohibit intermittent: periodic interpolate: insert between intrepid: bold, brave, fearless inundate: submerge, overwhelm inured: accustomed invective: verbal attack, abuse inveigh: denounce inveigle: tempt, entice invidious: designed to create ill will or envy iota: very small quantity irascible: irritable, easily angered irksome: tedious, annoying irreconcilable: not able to resolved, incompatible irremediable: uncorrectable, incurable irreproachable: impeccable itinerary: plan of a trip |