| humourless | (adjective) lacking humor | Synonyms: humorless, unhumorous |
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| humourous | (adjective) full of or characterized by humor | Synonyms: humorous |
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| hydrous | (adjective) containing combined water (especially water of crystallization as in a hydrate) | Synonyms: hydrated |
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| hymenopterous | (adjective) of or relating to insects of the order Hymenoptera | - |
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| hypognathous | (adjective) having a projecting lower jaw | Synonyms: prognathic, prognathous |
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| ichorous | (adjective) of or resembling or characterized by ichor or sanies | Synonyms: sanious |
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| idolatrous | (adjective) relating to or practicing idolatry | - |
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| (adjective) blindly or excessively devoted or adoring | - |
| igneous | (adjective) produced by the action of fire or intense heat | Synonyms: eruptive |
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| (adjective) produced under conditions involving intense heat | Synonyms: pyrogenic, pyrogenous |
| (adjective) like or suggestive of fire | Synonyms: fiery |
| ignominious | (adjective) (used of conduct or character) deserving or bringing disgrace or shame | Synonyms: black, disgraceful, inglorious, opprobrious, shameful |
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| illustrious | (adjective) having or conferring glory | - |
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| (adjective) widely known and esteemed | Synonyms: celebrated, famed, famous, far-famed, notable, noted, renowned |
| impecunious | (adjective) not having enough money to pay for necessities | Synonyms: hard up, in straitened circumstances, penniless, penurious, pinched |
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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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| 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 |
| inauspicious | (adjective) not auspicious; boding ill | Synonyms: unfortunate |
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| (adjective) contrary to your interests or welfare | Synonyms: adverse, untoward |
| (adjective) presaging ill fortune | Synonyms: ill, ominous |
| incautious | (adjective) lacking in caution | - |
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| (adjective) carelessly failing to exercise proper caution | - |
| incestuous | (adjective) relating to or involving incest | - |
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| (adjective) resembling incest as by excessive intimacy | - |
| incommodious | (adjective) uncomfortably or inconveniently small | - |
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| incongruous | (adjective) lacking in harmony or compatibility or appropriateness | - |
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| inconspicuous | (adjective) not prominent or readily noticeable | Synonyms: invisible |
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| incredulous | (adjective) not disposed or willing to believe; unbelieving | - |
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| incurious | (adjective) showing absence of intellectual inquisitiveness or natural curiosity | - |
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| indecorous | (adjective) lacking propriety and good taste in manners and conduct | Synonyms: indelicate |
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| (adjective) not in keeping with accepted standards of what is right or proper in polite society | Synonyms: indecent, unbecoming, uncomely, unseemly, untoward |
| indexless | (adjective) lacking an index | - |
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| indigenous | (adjective) originating where it is found | Synonyms: autochthonal, autochthonic, autochthonous, endemic |
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| industrious | (adjective) characterized by hard work and perseverance | Synonyms: hardworking, tireless, untiring |
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| (adjective) working hard to promote an enterprise | Synonyms: energetic, gumptious, up-and-coming |
| inefficacious | (adjective) lacking the power to produce a desired effect | - |
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| infamous | (adjective) known widely and usually unfavorably | Synonyms: ill-famed, notorious |
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| infectious | (adjective) easily spread | - |
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| (adjective) of or relating to infection | - |
| (adjective) caused by infection or capable of causing infection | Synonyms: infective |
| infelicitous | (adjective) not appropriate in application; defective | - |
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| (adjective) marked by or producing unhappiness | Synonyms: unhappy |
| ingenious | (adjective) showing inventiveness and skill | Synonyms: clever, cunning |
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| ingenuous | (adjective) characterized by an inability to mask your feelings; not devious | Synonyms: artless |
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| (adjective) lacking in sophistication or worldliness | Synonyms: innocent |
| inglorious | (adjective) not bringing honor and glory | - |
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| (adjective) (used of conduct or character) deserving or bringing disgrace or shame | Synonyms: black, disgraceful, ignominious, opprobrious, shameful |
| inharmonious | (adjective) not in harmony | Synonyms: unharmonious |
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| (adjective) lacking in harmony of parts | - |
| inhomogeneous | (adjective) not homogeneous | Synonyms: nonuniform |
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| iniquitous | (adjective) characterized by iniquity; wicked because it is believed to be a sin | Synonyms: sinful, ungodly |
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| injudicious | (adjective) lacking or showing lack of judgment or discretion; unwise | - |
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| injurious | (adjective) harmful to living things | Synonyms: deleterious, hurtful |
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| innocuous | (adjective) not injurious to physical or mental health | - |
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| (adjective) lacking intent or capacity to injure | Synonyms: innocent |
| (adjective) not causing disapproval | Synonyms: unobjectionable |
| innoxious | (adjective) having no adverse effect | - |
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| innumerous | (adjective) too numerous to be counted | Synonyms: countless, infinite, innumerable, multitudinous, myriad, numberless, uncounted, unnumberable, unnumbered, unnumerable |
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| inodorous | (adjective) having no odor | Synonyms: odorless, odourless |
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| insalubrious | (adjective) detrimental to health | Synonyms: unhealthful, unhealthy |
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| insectivorous | (adjective) (of animals and plants) feeding on insects | - |
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| 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 | - |
| instantaneous | (adjective) occurring with no delay | Synonyms: instant |
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| interspecies | (adjective) arising or occurring between species | Synonyms: interspecific |
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| intracutaneous | (adjective) relating to areas between the layers of the skin | Synonyms: intradermal, intradermic |
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| intraspecies | (adjective) arising or occurring within a species; involving the members of one species | Synonyms: intraspecific |
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| intravenous | (adjective) within or by means of a vein | Synonyms: endovenous |
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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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| irreligious | (adjective) hostile or indifferent to religion | - |
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| isochronous | (adjective) equal in duration or interval | Synonyms: isochronal |
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| isomorphous | (adjective) having similar appearance but genetically different | Synonyms: isomorphic |
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| isosceles | (adjective) (of a triangle) having two sides of equal length | - |
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| isotropous | (adjective) invariant with respect to direction | Synonyms: isotropic |
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| jawless | (adjective) of animals having no jaw | - |
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| jealous | (adjective) showing extreme cupidity; painfully desirous of another's advantages | Synonyms: covetous, envious |
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| (adjective) suspicious or unduly suspicious or fearful of being displaced by a rival | Synonyms: green-eyed, overjealous |
| jobless | (adjective) not having a job | Synonyms: idle, out of work |
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| joyless | (adjective) not experiencing or inspiring joy | - |
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| joyous | (adjective) full of or characterized by joy | - |
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| judicious | (adjective) marked by the exercise of good judgment or common sense in practical matters | Synonyms: heady, wise |
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| juiceless | (adjective) lacking juice | - |
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| (adjective) lacking interest or stimulation; dull and lifeless | Synonyms: dry |
| jumentous | (adjective) smelling strongly like a beast of burden | - |
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| keyless | (adjective) lacking or not requiring a key | - |
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| laborious | (adjective) characterized by effort to the point of exhaustion; especially physical effort | Synonyms: arduous, backbreaking, grueling, gruelling, hard, heavy, operose, punishing, toilsome |
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| landless | (adjective) owning no land | - |
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| languorous | (adjective) lacking spirit or liveliness | Synonyms: dreamy, lackadaisical, languid |
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| lascivious | (adjective) driven by lust; preoccupied with or exhibiting lustful desires | Synonyms: lewd, libidinous, lustful |
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| lawless | (adjective) without law or control | Synonyms: anarchic, anarchical |
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| (adjective) disobedient to or defiant of law | Synonyms: outlaw |
| (adjective) lax in enforcing laws | Synonyms: wide-open |
| leadless | (adjective) not treated with lead | Synonyms: unleaded |
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| leafless | (adjective) having no leaves | - |
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| lecherous | (adjective) given to excessive indulgence in sexual activity | - |
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| legless | (adjective) not having legs | - |
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| leguminous | (adjective) relating to or consisting of legumes | - |
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| lengthways | (adjective) running or extending in the direction of the length of a thing | Synonyms: lengthwise |
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| lentiginous | (adjective) relating to or covered with or resembling freckles | Synonyms: freckled, lentiginose |
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| leprous | (adjective) relating to or resembling or having leprosy | - |
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| less | (adjective) (comparative of `little' usually used with mass nouns) a quantifier meaning not as great in amount or degree | - |
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| (adjective) (nonstandard in some uses but often idiomatic with measure phrases) fewer | - |
| (adjective) (usually preceded by `no') lower in quality | - |
| libellous | (adjective) (used of statements) harmful and often untrue; tending to discredit or malign | Synonyms: calumniatory, calumnious, defamatory, denigrating, denigrative, denigratory, libelous, slanderous |
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| libelous | (adjective) (used of statements) harmful and often untrue; tending to discredit or malign | Synonyms: calumniatory, calumnious, defamatory, denigrating, denigrative, denigratory, libellous, slanderous |
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| libidinous | (adjective) driven by lust; preoccupied with or exhibiting lustful desires | Synonyms: lascivious, lewd, lustful |
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| licentious | (adjective) lacking moral discipline; especially sexually unrestrained | - |
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| lidless | (adjective) not having or covered with a lid or lids | - |
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| (adjective) always watchful | Synonyms: sleepless |
| (adjective) having no lid | - |
| lifeless | (adjective) not having the capacity to support life | - |
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| (adjective) destitute or having been emptied of life or living beings | - |
| (adjective) lacking animation or excitement or activity | - |
| (adjective) deprived of life; no longer living | Synonyms: exanimate |
| lightless | (adjective) without illumination | Synonyms: unilluminated, unlighted, unlit |
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| (adjective) giving no light | - |
| ligneous | (adjective) consisting of or containing lignin or xylem | - |
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| liliaceous | (adjective) of or pertaining to or characteristic of plants of the family Liliaceae | - |
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| limbless | (adjective) having no limbs | - |
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| 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 |
| lipless | (adjective) without a lip or lips | Synonyms: unlipped |
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| listless | (adjective) lacking zest or vivacity | - |
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| (adjective) marked by low spirits; showing no enthusiasm | Synonyms: dispirited |
| litigious | (adjective) of or relating to litigation | - |
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| (adjective) inclined or showing an inclination to dispute or disagree, even to engage in law suits | Synonyms: combative, contentious, disputatious, disputative |
| loamless | (adjective) having no loam | - |
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| lobeliaceous | (adjective) belonging to the family Lobeliaceae | - |
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| longanimous | (adjective) showing patient and unruffled self-control and restraint under adversity; slow to retaliate or express resentment | Synonyms: forbearing |
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| loquacious | (adjective) full of trivial conversation | Synonyms: chatty, gabby, garrulous, talkative, talky |
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