| 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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| inanimate | (adjective) not endowed with life | Synonyms: non-living, nonliving |
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| (adjective) belonging to the class of nouns denoting nonliving things | - |
| (adjective) appearing dead; not breathing or having no perceptible pulse | Synonyms: breathless, pulseless |
| incriminating | (adjective) charging or suggestive of guilt or blame | Synonyms: criminative, criminatory, incriminatory |
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| incriminatory | (adjective) charging or suggestive of guilt or blame | Synonyms: criminative, criminatory, incriminating |
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| indiscriminate | (adjective) not marked by fine distinctions | - |
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| (adjective) failing to make or recognize distinctions | - |
| indiscriminating | (adjective) not discriminating | Synonyms: undiscriminating |
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| inestimable | (adjective) beyond calculation or measure | Synonyms: immeasurable, incomputable |
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| infinitesimal | (adjective) infinitely or immeasurably small | Synonyms: minute |
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| inimical | (adjective) not friendly | Synonyms: unfriendly |
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| inimitable | (adjective) defying imitation; matchless | - |
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| interim | (adjective) serving during an intermediate interval of time | - |
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| intimal | (adjective) of or relating to the intima | - |
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| intimate | (adjective) marked by close acquaintance, association, or familiarity | - |
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| (adjective) thoroughly acquainted through study or experience | Synonyms: knowledgeable, versed |
| (adjective) having or fostering a warm or friendly and informal atmosphere | Synonyms: cosy, cozy, informal |
| (adjective) innermost or essential | Synonyms: inner, internal |
| (adjective) concerning things deeply private and personal | Synonyms: private |
| (adjective) used euphemistically to refer to the genitals | - |
| (adjective) involved in a sexual relationship | Synonyms: sexual |
| (adjective) having mutual interests or affections; of established friendship | Synonyms: familiar |
| intimidated | (adjective) made timid or fearful as by threats | - |
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| intimidating | (adjective) discouraging through fear | Synonyms: daunting |
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| irreclaimable | (adjective) insusceptible of reform | Synonyms: irredeemable, unredeemable, unreformable |
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| lacrimal | (adjective) of or relating to tears | Synonyms: lachrymal |
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| (adjective) relating to or located near the organ that produces tears | Synonyms: lachrymal |
| lacrimatory | (adjective) relating to or prompting tears | Synonyms: lachrymatory |
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| larghissimo | (adjective) (of tempo) as slow and broad as possible | - |
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| legitimate | (adjective) of marriages and offspring; recognized as lawful | - |
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| (adjective) in accordance with recognized or accepted standards or principles | - |
| (adjective) authorized, sanctioned by, or in accordance with law | Synonyms: lawful, licit |
| (adjective) based on known statements or events or conditions | Synonyms: logical |
| lentissimo | (adjective) (of tempo) very slow | - |
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| limacine | (adjective) of or resembling a slug | Synonyms: limacoid |
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| limacoid | (adjective) of or resembling a slug | Synonyms: limacine |
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| limbed | (adjective) having or as if having limbs, especially limbs of a specified kind (usually used in combination) | - |
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| limber | (adjective) (used of persons' bodies) capable of moving or bending freely | Synonyms: supple |
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| (adjective) (used of e.g. personality traits) readily adaptable | Synonyms: supple |
| (adjective) (used of artifacts) easily bent | - |
| limbic | (adjective) of or relating to or forming a limbus | - |
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| limbless | (adjective) having no limbs | - |
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| limited | (adjective) small in range or scope | - |
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| (adjective) not unlimited | - |
| (adjective) not excessive | - |
| (adjective) including only a part | - |
| (adjective) mediocre | Synonyms: modified |
| (adjective) subject to limits or subjected to limits | Synonyms: circumscribed |
| (adjective) having a specific function or scope | Synonyms: special |
| limiting | (adjective) strictly limiting the reference of a modified word or phrase | - |
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| (adjective) restricting the scope or freedom of action | Synonyms: confining, constraining, constrictive, restricting |
| limitless | (adjective) having no limits in range or scope | Synonyms: unlimited |
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| (adjective) without limits in extent or size or quantity | Synonyms: illimitable, measureless, unmeasured |
| (adjective) seemingly boundless in amount, number, degree, or especially extent | Synonyms: boundless, unbounded |
| limnological | (adjective) of or relating to limnology | - |
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| limp | (adjective) lacking or having lost rigidity | - |
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| (adjective) without energy or will | Synonyms: wilted |
| limpid | (adjective) (of language) transparently clear; easily understandable | Synonyms: crystal clear, lucid, luculent, pellucid, perspicuous |
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| (adjective) transmitting light; able to be seen through with clarity | Synonyms: crystal clear, crystalline, lucid, pellucid, transparent |
| (adjective) clear and bright | Synonyms: liquid |
| longanimous | (adjective) showing patient and unruffled self-control and restraint under adversity; slow to retaliate or express resentment | Synonyms: forbearing |
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| longtime | (adjective) having existed or persisted or continued in a particular role or state for a long time | Synonyms: long-time |
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| magnanimous | (adjective) generous and understanding and tolerant | Synonyms: big, large |
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| (adjective) noble and generous in spirit | Synonyms: greathearted |
| maimed | (adjective) having a part of the body crippled or disabled | Synonyms: mutilated |
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| maritime | (adjective) relating to or involving ships or shipping or navigation or seamen | Synonyms: marine, nautical |
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| (adjective) bordering on or living or characteristic of those near the sea | - |
| matrimonial | (adjective) of or relating to the state of marriage | Synonyms: marital, married |
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| maximal | (adjective) the greatest or most complete or best possible | Synonyms: maximum |
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| maximising | (adjective) making as great as possible | Synonyms: maximizing |
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| maximizing | (adjective) making as great as possible | Synonyms: maximising |
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| maximum | (adjective) the greatest or most complete or best possible | Synonyms: maximal |
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| mimetic | (adjective) exhibiting mimicry | - |
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| (adjective) characterized by or of the nature of or using mimesis | - |
| mimic | (adjective) constituting an imitation | - |
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| minimal | (adjective) the least possible | Synonyms: minimum |
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| minimalist | (adjective) of or relating to artistic minimalism | - |
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| (adjective) advocating minimal reforms (as in government or politics) | - |
| minimized | (adjective) reduced to the smallest possible size or amount or degree | - |
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| minimum | (adjective) the least possible | Synonyms: minimal |
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| multidimensional | (adjective) having or involving or marked by several dimensions or aspects | - |
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