| impacted | (adjective) wedged or packed in together | Synonyms: wedged |
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| impaired | (adjective) diminished in strength, quality, or utility | - |
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| (adjective) mentally or physically unfit | Synonyms: afflicted |
| impalpable | (adjective) imperceptible to the senses or the mind | - |
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| (adjective) incapable of being perceived by the senses especially the sense of touch | Synonyms: intangible |
| (adjective) not perceptible to the touch | - |
| imparipinnate | (adjective) (a leaf shape) pinnate with a single leaflet at the apex | Synonyms: odd-pinnate |
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| impartial | (adjective) showing lack of favoritism | - |
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| (adjective) free from undue bias or preconceived opinions | Synonyms: unprejudiced |
| impassable | (adjective) incapable of being passed | Synonyms: unpassable |
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| impassioned | (adjective) characterized by intense emotion | Synonyms: ardent, fervent, fervid, fiery, perfervid, torrid |
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| impassive | (adjective) deliberately impassive in manner | Synonyms: deadpan, expressionless, poker-faced, unexpressive |
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| (adjective) having or revealing little emotion or sensibility; not easily aroused or excited | Synonyms: stolid |
| impatient | (adjective) restless or short-tempered under delay or opposition | - |
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| (adjective) (usually followed by `to') full of eagerness | Synonyms: raring |
| impeccable | (adjective) without fault or error | Synonyms: faultless, immaculate, incorrupted |
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| (adjective) not capable of sin | - |
| impeccant | (adjective) free from sin | Synonyms: innocent, sinless |
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| impecunious | (adjective) not having enough money to pay for necessities | Synonyms: hard up, in straitened circumstances, penniless, penurious, pinched |
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| impeded | (adjective) made difficult or slow | - |
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| impeding | (adjective) preventing movement | Synonyms: clogging, hindering, obstructive |
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| impelled | (adjective) urged or forced to action through moral pressure | Synonyms: driven |
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| impellent | (adjective) forcing forward or onward; impelling | - |
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| impelling | (adjective) markedly effective as if by emotional pressure | - |
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| impendent | (adjective) close in time; about to occur | Synonyms: at hand, close at hand, imminent, impending |
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| impending | (adjective) close in time; about to occur | Synonyms: at hand, close at hand, imminent, impendent |
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| impenetrable | (adjective) not admitting of penetration or passage into or through | - |
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| (adjective) impossible to understand | - |
| (adjective) permitting little if any light to pass through because of denseness of matter | Synonyms: dense, heavy |
| impenitent | (adjective) not penitent or remorseful | Synonyms: unremorseful, unrepentant |
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| (adjective) impervious to moral persuasion | - |
| imperative | (adjective) requiring attention or action | - |
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| (adjective) relating to verbs in the imperative mood | - |
| imperceptible | (adjective) impossible or difficult to perceive by the mind or senses | Synonyms: unperceivable |
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| imperfect | (adjective) not perfect; defective or inadequate | - |
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| (adjective) wanting in moral strength, courage, or will; having the attributes of man as opposed to e.g. divine beings | Synonyms: fallible, frail, weak |
| imperfectible | (adjective) capable of being made imperfect | - |
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| imperforate | (adjective) not perforated; having no opening | - |
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| imperial | (adjective) befitting or belonging to an emperor or empress | - |
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| (adjective) relating to or associated with an empire | - |
| (adjective) of or belonging to the British Imperial System of weights and measures | - |
| (adjective) belonging to or befitting a supreme ruler | Synonyms: majestic, purple, regal, royal |
| imperialist | (adjective) of or relating to imperialism | Synonyms: imperialistic |
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| imperialistic | (adjective) of or relating to imperialism | Synonyms: imperialist |
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| imperious | (adjective) having or showing arrogant superiority to and disdain of those one views as unworthy | Synonyms: disdainful, haughty, lordly, overbearing, prideful, sniffy, supercilious, swaggering |
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| imperishable | (adjective) not perishable | - |
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| (adjective) lasting a long time | Synonyms: abiding, enduring |
| impermanent | (adjective) not permanent; not lasting | Synonyms: temporary |
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| (adjective) existing or enduring for a limited time only | - |
| impermeable | (adjective) preventing especially liquids to pass or diffuse through | - |
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| impermissible | (adjective) not permitted | - |
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| (adjective) not allowable | - |
| impersonal | (adjective) not relating to or responsive to individual persons | - |
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| (adjective) having no personal preference | Synonyms: neutral |
| impertinent | (adjective) improperly forward or bold | Synonyms: fresh, impudent, overbold, sassy, saucy, smart, wise |
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| (adjective) not pertinent to the matter under consideration | Synonyms: extraneous, immaterial, orthogonal |
| (adjective) characterized by a lightly pert and exuberant quality | Synonyms: irreverent, pert, saucy |
| imperturbable | (adjective) not easily perturbed or excited or upset; marked by extreme calm and composure | Synonyms: unflappable |
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| imperviable | (adjective) not admitting of passage or capable of being affected | Synonyms: impervious |
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| impervious | (adjective) not admitting of passage or capable of being affected | Synonyms: imperviable |
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| impetiginous | (adjective) of or relating to or having impetigo | - |
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| impetuous | (adjective) marked by violent force | - |
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| (adjective) characterized by undue haste and lack of thought or deliberation | Synonyms: brainish, hotheaded, impulsive, madcap, tearaway |
| impious | (adjective) lacking piety or reverence for a god | - |
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| (adjective) lacking due respect or dutifulness | Synonyms: undutiful |
| impish | (adjective) naughtily or annoyingly playful | Synonyms: arch, implike, mischievous, pixilated, prankish, puckish, wicked |
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| implacable | (adjective) incapable of being placated | - |
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| implanted | (adjective) (used especially of ideas or principles) deeply rooted; firmly fixed or held | Synonyms: deep-rooted, deep-seated, ingrained, planted |
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| implausible | (adjective) having a quality that provokes disbelief | - |
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| implemental | (adjective) serving or acting as a means or aid | Synonyms: instrumental, subservient |
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| implemented | (adjective) forced or compelled or put in force | Synonyms: enforced |
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| implicated | (adjective) culpably involved | Synonyms: concerned |
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| implicational | (adjective) relating to or concerned with logical implication | - |
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| implicative | (adjective) tending to suggest or imply | Synonyms: suggestive |
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| implicit | (adjective) implied though not directly expressed; inherent in the nature of something | Synonyms: inexplicit |
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| (adjective) being without doubt or reserve | Synonyms: unquestioning |
| implike | (adjective) naughtily or annoyingly playful | Synonyms: arch, impish, mischievous, pixilated, prankish, puckish, wicked |
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| imploring | (adjective) begging | Synonyms: beseeching, pleading |
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| impolite | (adjective) not polite | - |
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| impolitic | (adjective) not politic | - |
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| imponderable | (adjective) difficult or impossible to evaluate with precision | - |
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| important | (adjective) of great significance or value | Synonyms: of import |
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| (adjective) of extreme importance; vital to the resolution of a crisis | Synonyms: crucial |
| (adjective) important in effect or meaning | Synonyms: significant |
| (adjective) having or suggesting a consciousness of high position | - |
| (adjective) having authority or ascendancy or influence | Synonyms: authoritative |
| imported | (adjective) used of especially merchandise brought from a foreign source | - |
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| importunate | (adjective) persistent to the point of annoying | - |
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| (adjective) expressing persistant and earnest entreaty | - |
| imposed | (adjective) set forth authoritatively as obligatory | - |
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| imposing | (adjective) used of a person's appearance or behavior; befitting an eminent person | Synonyms: distinguished, grand, magisterial |
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| (adjective) impressive in size, manner, or appearance | Synonyms: baronial, noble, stately |
| impossible | (adjective) not capable of occurring or being accomplished or dealt with | - |
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| (adjective) (used of persons or their behavior) not acceptable or reasonable | Synonyms: unacceptable |
| (adjective) totally unlikely | Synonyms: inconceivable, out of the question, unimaginable |
| impotent | (adjective) lacking power or ability | - |
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| (adjective) (of a male) unable to copulate | - |
| impoverished | (adjective) destroyed financially | Synonyms: broken, wiped out |
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| (adjective) poor enough to need help from others | Synonyms: destitute, indigent, necessitous, needy, poverty-stricken |
| impracticable | (adjective) not capable of being carried out or put into practice | Synonyms: infeasible, unfeasible, unworkable |
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| impractical | (adjective) not practical; not workable or not given to practical matters | - |
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| (adjective) not practical or realizable; speculative | Synonyms: airy, Laputan, visionary, windy |
| imprecise | (adjective) not precise | - |
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| impregnable | (adjective) capable of conceiving | Synonyms: conceptive |
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| (adjective) immune to attack; incapable of being tampered with | Synonyms: inviolable, secure, strong, unassailable, unattackable |
| (adjective) incapable of being overcome, challenged or refuted | Synonyms: inexpugnable |
| impressed | (adjective) deeply or markedly affected or influenced | - |
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| impressible | (adjective) easily impressed or influenced | Synonyms: impressionable, waxy |
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| impressionable | (adjective) easily impressed or influenced | Synonyms: impressible, waxy |
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| impressionist | (adjective) relating to or characteristic of Impressionism | Synonyms: impressionistic |
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| impressionistic | (adjective) relating to or characteristic of Impressionism | Synonyms: impressionist |
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| (adjective) of or relating to or based on an impression rather than on facts or reasoning | - |
| impressive | (adjective) making a strong or vivid impression | - |
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| (adjective) producing a strong effect | Synonyms: telling |
| imprisoned | (adjective) being in captivity | Synonyms: captive, confined, jailed |
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| improbable | (adjective) not likely to be true or to occur or to have occurred | Synonyms: unlikely |
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| (adjective) having a probability too low to inspire belief | Synonyms: unbelievable, unconvincing, unlikely |
| (adjective) too improbable to admit of belief | Synonyms: marvellous, marvelous, tall |
| impromptu | (adjective) with little or no preparation or forethought | Synonyms: ad-lib, extemporaneous, extemporary, extempore, off-the-cuff, offhand, offhanded, unrehearsed |
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| improper | (adjective) not suitable or right or appropriate | - |
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| (adjective) not appropriate for a purpose or occasion | Synonyms: wrong |
| (adjective) not conforming to legality, moral law, or social convention | Synonyms: unconventional, unlawful |
| improvable | (adjective) susceptible of improvement | - |
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| improved | (adjective) made more desirable or valuable or profitable; especially made ready for use or marketing | - |
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| (adjective) become or made better in quality | - |
| (adjective) (of land) made ready for development or agriculture by clearing of trees and brush | - |
| improvident | (adjective) not provident; not providing for the future | - |
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| (adjective) not given careful consideration | Synonyms: ill-considered, ill-judged, shortsighted |
| improving | (adjective) getting higher or more vigorous | Synonyms: up |
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| improvised | (adjective) done or made using whatever is available | Synonyms: jury-rigged, makeshift |
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| imprudent | (adjective) not prudent or wise | - |
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| (adjective) lacking wise self-restraint | - |
| impudent | (adjective) marked by casual disrespect | Synonyms: flip, insolent, snotty-nosed |
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| (adjective) improperly forward or bold | Synonyms: fresh, impertinent, overbold, sassy, saucy, smart, wise |
| impugnable | (adjective) subject to being discredited | - |
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| impuissant | (adjective) lacking physical strength or vigor | - |
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| impulsive | (adjective) determined by chance or impulse or whim rather than by necessity or reason | Synonyms: capricious, whimsical |
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| (adjective) having the power of driving or impelling | Synonyms: driving |
| (adjective) characterized by undue haste and lack of thought or deliberation | Synonyms: brainish, hotheaded, impetuous, madcap, tearaway |
| (adjective) proceeding from natural feeling or impulse without external stimulus | Synonyms: unprompted |
| (adjective) without forethought | - |
| impure | (adjective) (used of persons or behaviors) immoral or obscene | - |
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| (adjective) combined with extraneous elements | - |
| (adjective) having a physical or moral blemish so as to make impure according to dietary or ceremonial laws | Synonyms: unclean |
| imputable | (adjective) capable of being assigned or credited to | Synonyms: ascribable, due, referable |
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| imputrescible | (adjective) not subject to decay | - |
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