| hideous | (adjective) grossly offensive to decency or morality; causing horror | Synonyms: horrid, horrific, outrageous |
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| (adjective) so extremely ugly as to be terrifying | Synonyms: repulsive |
| hidrotic | (adjective) of or relating to sweat | - |
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| hispid | (adjective) (of animals or plants) having stiff coarse hairs or bristles | - |
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| homicidal | (adjective) characteristic of or capable of or having a tendency toward killing another human being | Synonyms: murderous |
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| hominid | (adjective) characterizing the family Hominidae, which includes Homo sapiens as well as extinct species of manlike creatures | Synonyms: hominian |
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| horrid | (adjective) exceedingly bad | - |
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| (adjective) grossly offensive to decency or morality; causing horror | Synonyms: hideous, horrific, outrageous |
| humid | (adjective) containing or characterized by a great deal of water vapor | - |
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| hyaloid | (adjective) resembling glass in transparency or translucency | Synonyms: hyaline |
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| hybrid | (adjective) produced by crossbreeding | Synonyms: intercrossed |
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| hyoid | (adjective) of or relating to the hyoid bone | - |
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| hyperboloidal | (adjective) having the shape of a hyperboloid | - |
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| hypnoid | (adjective) of or relating to a state of sleep or hypnosis | - |
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| ideal | (adjective) of or relating to the philosophical doctrine of the reality of ideas | Synonyms: idealistic |
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| (adjective) constituting or existing only in the form of an idea or mental image or conception | - |
| (adjective) conforming to an ultimate standard of perfection or excellence; embodying an ideal | - |
| idealised | (adjective) exalted to an ideal perfection or excellence | Synonyms: idealized |
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| idealistic | (adjective) of or relating to the philosophical doctrine of the reality of ideas | Synonyms: ideal |
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| (adjective) of high moral or intellectual value; elevated in nature or style | Synonyms: elevated, exalted, grand, high-flown, high-minded, lofty, noble-minded, rarefied, rarified, sublime |
| idealized | (adjective) exalted to an ideal perfection or excellence | Synonyms: idealised |
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| ideational | (adjective) being of the nature of a notion or concept | Synonyms: conceptional, notional |
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| idempotent | (adjective) unchanged in value following multiplication by itself | - |
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| identical | (adjective) (of twins) derived from a single egg or ovum | Synonyms: monovular |
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| (adjective) coinciding exactly when superimposed | Synonyms: superposable |
| (adjective) having properties with uniform values along all axes | - |
| (adjective) exactly alike; incapable of being perceived as different | Synonyms: indistinguishable |
| (adjective) being the exact same one; not any other: | Synonyms: selfsame, very |
| identifiable | (adjective) capable of being identified | - |
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| identified | (adjective) having the identity known or established | - |
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| ideographic | (adjective) of or relating to or consisting of ideograms | - |
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| ideologic | (adjective) concerned with or suggestive of ideas | Synonyms: ideological |
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| ideological | (adjective) of or pertaining to or characteristic of an orientation that characterizes the thinking of a group or nation | - |
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| (adjective) concerned with or suggestive of ideas | Synonyms: ideologic |
| idiographic | (adjective) relating to or involving the study of individuals | - |
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| idiomatic | (adjective) of or relating to or conforming to idiom | Synonyms: idiomatical |
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| idiomatical | (adjective) of or relating to or conforming to idiom | Synonyms: idiomatic |
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| idiopathic | (adjective) (of diseases) arising from an unknown cause | - |
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| idiosyncratic | (adjective) peculiar to the individual | - |
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| idiotic | (adjective) so unreasonable as to invite derision | Synonyms: absurd, cockeyed, derisory, laughable, ludicrous, nonsensical, preposterous, ridiculous |
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| (adjective) insanely irresponsible | Synonyms: crackbrained |
| (adjective) having a mental age of three to seven years | Synonyms: imbecile, imbecilic |
| idle | (adjective) not in action or at work | - |
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| (adjective) silly or trivial | Synonyms: light |
| (adjective) not in active use | Synonyms: unused |
| (adjective) lacking a sense of restraint or responsibility | Synonyms: loose |
| (adjective) not having a job | Synonyms: jobless, out of work |
| (adjective) not yielding a return | Synonyms: dead |
| (adjective) without a basis in reason or fact | Synonyms: baseless, groundless, unfounded, unwarranted, wild |
| idolatrous | (adjective) relating to or practicing idolatry | - |
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| (adjective) blindly or excessively devoted or adoring | - |
| idolised | (adjective) regarded with deep or rapturous love (especially as if for a god) | Synonyms: adored, idolized, worshipped |
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| idolized | (adjective) regarded with deep or rapturous love (especially as if for a god) | Synonyms: adored, idolised, worshipped |
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| idyllic | (adjective) excellent and delightful in all respects | - |
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| (adjective) suggestive of an idyll; charmingly simple and serene | - |
| improvident | (adjective) not provident; not providing for the future | - |
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| (adjective) not given careful consideration | Synonyms: ill-considered, ill-judged, shortsighted |
| incident | (adjective) (sometimes followed by `to') minor or casual or subordinate in significance or nature or occurring as a chance concomitant or consequence | Synonyms: incidental |
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| (adjective) falling or striking of light rays on something | - |
| incidental | (adjective) (sometimes followed by `to') minor or casual or subordinate in significance or nature or occurring as a chance concomitant or consequence | Synonyms: incident |
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| (adjective) not of prime or central importance | Synonyms: accidental, nonessential |
| (adjective) occurring with or following as a consequence | Synonyms: accompanying, attendant, collateral, concomitant, consequent, ensuant, resultant, sequent |
| inconsiderable | (adjective) too small or unimportant to merit attention | - |
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| inconsiderate | (adjective) lacking regard for the rights or feelings of others | - |
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| (adjective) without proper consideration or reflection | Synonyms: unconsidered |
| individual | (adjective) being or characteristic of a single thing or person | Synonyms: single |
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| (adjective) separate and distinct from others of the same kind | Synonyms: case-by-case, item-by-item |
| (adjective) concerning one person exclusively | Synonyms: private |
| (adjective) characteristic of or meant for a single person or thing | Synonyms: single |
| individualised | (adjective) made for or directed or adjusted to a particular individual | Synonyms: individualized, personalised, personalized |
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| individualist | (adjective) marked by or expressing individuality | Synonyms: individualistic |
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| individualistic | (adjective) with minimally restricted freedom in commerce | Synonyms: laissez-faire |
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| (adjective) marked by or expressing individuality | Synonyms: individualist |
| individualized | (adjective) made for or directed or adjusted to a particular individual | Synonyms: individualised, personalised, personalized |
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| inlaid | (adjective) adorned by inlays | - |
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| insecticidal | (adjective) of or relating to insecticide | - |
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| inside | (adjective) relating to or being on the side closer to the center or within a defined space | - |
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| (adjective) confined to an exclusive group | Synonyms: inner, privileged |
| (adjective) away from the outer edge | - |
| (adjective) being or applying to the inside of a building | - |
| insidious | (adjective) intended to entrap | - |
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| (adjective) working or spreading in a hidden and usually injurious way | Synonyms: pernicious, subtle |
| (adjective) beguiling but harmful | - |
| insipid | (adjective) lacking taste or flavor or tang | Synonyms: bland, flat, flavorless, flavourless, savorless, savourless, vapid |
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| (adjective) lacking interest or significance or impact | Synonyms: jejune |
| intertidal | (adjective) of or relating to the littoral area above the low-tide mark | - |
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| intimidated | (adjective) made timid or fearful as by threats | - |
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| intimidating | (adjective) discouraging through fear | Synonyms: daunting |
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| intrepid | (adjective) invulnerable to fear or intimidation | Synonyms: audacious, brave, dauntless, fearless, hardy, unfearing |
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| invalid | (adjective) having no cogency or legal force | - |
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| (adjective) no longer valid | - |
| invalidated | (adjective) deprived of legal force | Synonyms: nullified |
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| invalidating | (adjective) establishing as invalid or untrue | Synonyms: disconfirming |
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| invidious | (adjective) containing or implying a slight or showing prejudice | Synonyms: discriminatory |
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| iridaceous | (adjective) of or pertaining to or characteristic of plants of the family Iridaceae | - |
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| iridescent | (adjective) having a play of lustrous rainbow colors | Synonyms: nacreous, opalescent, opaline, pearlescent |
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| (adjective) varying in color when seen in different lights or from different angles | Synonyms: changeable, chatoyant, shot |
| iridic | (adjective) of or relating to the iris of the eye | - |
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| (adjective) of or containing iridium | - |
| juridic | (adjective) relating to the administration of justice or the function of a judge | Synonyms: judicial, juridical |
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| (adjective) of or relating to the law or jurisprudence | Synonyms: juridical |
| juridical | (adjective) relating to the administration of justice or the function of a judge | Synonyms: judicial, juridic |
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| (adjective) of or relating to the law or jurisprudence | Synonyms: juridic |
| kaleidoscopic | (adjective) continually shifting or rapidly changing | Synonyms: kaleidoscopical |
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| kaleidoscopical | (adjective) continually shifting or rapidly changing | Synonyms: kaleidoscopic |
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| laid | (adjective) set down according to a plan | Synonyms: set |
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| languid | (adjective) lacking spirit or liveliness | Synonyms: dreamy, lackadaisical, languorous |
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| lapidarian | (adjective) inscribed on stone | - |
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| lapidary | (adjective) of or relating to precious stones or the art of working with them | - |
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| lepidote | (adjective) rough to the touch; covered with scales or scurf | Synonyms: leprose, scabrous, scaly, scurfy |
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| libidinal | (adjective) belonging to the libido | - |
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| libidinous | (adjective) driven by lust; preoccupied with or exhibiting lustful desires | Synonyms: lascivious, lewd, lustful |
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| lidded | (adjective) having or covered with a lid or lids; often used in combination | - |
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| (adjective) having a lid | - |
| lidless | (adjective) not having or covered with a lid or lids | - |
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| (adjective) always watchful | Synonyms: sleepless |
| (adjective) having no lid | - |
| limacoid | (adjective) of or resembling a slug | Synonyms: limacine |
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| 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 |
| liquid | (adjective) existing as or having characteristics of a liquid; especially tending to flow | - |
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| (adjective) changed from a solid to a liquid state | Synonyms: liquified, melted |
| (adjective) clear and bright | Synonyms: limpid |
| (adjective) in cash or easily convertible to cash | Synonyms: fluid |
| (adjective) smooth and unconstrained in movement | Synonyms: fluent, fluid, smooth |
| (adjective) smooth and flowing in quality; entirely free of harshness | - |
| (adjective) filled or brimming with tears | Synonyms: swimming |
| livid | (adjective) furiously angry | - |
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| (adjective) anemic looking from illness or emotion | Synonyms: ashen, blanched, bloodless, white |
| (adjective) discolored by coagulation of blood beneath the skin | Synonyms: black-and-blue |
| (adjective) (of a light) imparting a deathlike luminosity | - |
| lopsided | (adjective) having one side lower or smaller or lighter than the other | - |
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| (adjective) turned or twisted toward one side | Synonyms: askew, awry, cockeyed, skew-whiff, wonky |
| lucid | (adjective) (of language) transparently clear; easily understandable | Synonyms: crystal clear, limpid, luculent, pellucid, perspicuous |
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| (adjective) transmitting light; able to be seen through with clarity | Synonyms: crystal clear, crystalline, limpid, pellucid, transparent |
| (adjective) capable of thinking and expressing yourself in a clear and consistent manner | Synonyms: coherent, logical |
| (adjective) having a clear mind | - |
| lurid | (adjective) shining with an unnatural red glow as of fire seen through smoke | - |
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| (adjective) ghastly pale | - |
| (adjective) glaringly vivid and graphic; marked by sensationalism | Synonyms: shocking |
| (adjective) horrible in fierceness or savagery | - |
| lymphoid | (adjective) resembling lymph or lymphatic tissues | - |
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| maiden | (adjective) serving to set in motion | Synonyms: first, inaugural, initiative, initiatory |
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| maidenlike | (adjective) befitting or characteristic of a maiden | Synonyms: maidenly |
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| maidenly | (adjective) befitting or characteristic of a maiden | Synonyms: maidenlike |
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| mastoid | (adjective) relating to or resembling a nipple | Synonyms: mastoidal |
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| (adjective) of or relating to or in the region of the mastoid process | - |
| mastoidal | (adjective) relating to or resembling a nipple | Synonyms: mastoid |
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| medusoid | (adjective) relating to or resembling a medusa | - |
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| meridian | (adjective) of or happening at noon | - |
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| (adjective) being at the best stage of development | Synonyms: prime |
| meridional | (adjective) of or relating to a meridian | - |
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| (adjective) located in the south or characteristic of southern people or places | - |
| metalloid | (adjective) of or being a nonmetallic element that has some of the properties of metal | - |
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| mid | (adjective) used in combination to denote the middle | - |
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| middle | (adjective) between an earlier and a later period of time | - |
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| (adjective) of a stage in the development of a language or literature between earlier and later stages | - |
| (adjective) being neither at the beginning nor at the end in a series | Synonyms: in-between, mediate |
| (adjective) equally distant from the extremes | Synonyms: center, centre, halfway, midway |
| middlemost | (adjective) being in the exact middle | Synonyms: midmost |
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| middling | (adjective) lacking exceptional quality or ability | Synonyms: average, fair, mediocre |
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| midget | (adjective) very small | Synonyms: bantam, diminutive, flyspeck, lilliputian, petite, tiny |
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| midi | (adjective) used of women's clothing having a hemline at mid-calf | - |
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| midland | (adjective) of or coming from the middle of a region or country | Synonyms: interior, upcountry |
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| midmost | (adjective) being in the exact middle | Synonyms: middlemost |
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| midway | (adjective) equally distant from the extremes | Synonyms: center, centre, halfway, middle |
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