| 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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| illusional | (adjective) marked by or producing illusion | Synonyms: illusionary |
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| illusionary | (adjective) marked by or producing illusion | Synonyms: illusional |
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| illusive | (adjective) based on or having the nature of an illusion | Synonyms: illusory |
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| illusory | (adjective) based on or having the nature of an illusion | Synonyms: illusive |
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| illustrative | (adjective) clarifying by use of examples | Synonyms: exemplifying |
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| (adjective) serving to demonstrate | Synonyms: demonstrative |
| 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 |
| implausible | (adjective) having a quality that provokes disbelief | - |
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| 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 | - |
| inclusive | (adjective) including much or everything; and especially including stated limits | - |
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| incombustible | (adjective) not capable of igniting and burning | Synonyms: noncombustible |
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| incommodious | (adjective) uncomfortably or inconveniently small | - |
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| inconclusive | (adjective) not conclusive; not putting an end to doubt or question | - |
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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 |
| indigenous | (adjective) originating where it is found | Synonyms: autochthonal, autochthonic, autochthonous, endemic |
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| indusial | (adjective) of or relating to or being an indusium | - |
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| industrial | (adjective) having highly developed industries | - |
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| (adjective) of or relating to or resulting from industry | - |
| (adjective) employed in industry | - |
| (adjective) suitable to stand up to hard wear | - |
| industrialised | (adjective) made industrial; converted to industrialism | Synonyms: industrialized |
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| industrialized | (adjective) made industrial; converted to industrialism | Synonyms: industrialised |
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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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| inexcusable | (adjective) without excuse or justification | - |
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| (adjective) not excusable | Synonyms: unforgivable |
| inexhaustible | (adjective) incapable of being entirely consumed or used up | - |
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| (adjective) that cannot be entirely consumed or used up | Synonyms: unlimited |
| 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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| insusceptible | (adjective) not susceptible to | Synonyms: unsusceptible |
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| intracutaneous | (adjective) relating to areas between the layers of the skin | Synonyms: intradermal, intradermic |
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| intramuscular | (adjective) within a muscle | - |
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| intravenous | (adjective) within or by means of a vein | Synonyms: endovenous |
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| intrusive | (adjective) tending to intrude (especially upon privacy) | - |
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| (adjective) thrusting inward | - |
| (adjective) of rock material; forced while molten into cracks between layers of other rock | - |
| 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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| isotropous | (adjective) invariant with respect to direction | Synonyms: isotropic |
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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 |
| 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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| jumentous | (adjective) smelling strongly like a beast of burden | - |
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| just | (adjective) used especially of what is legally or ethically right or proper or fitting | - |
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| (adjective) fair to all parties as dictated by reason and conscience | Synonyms: equitable |
| (adjective) free from favoritism or self-interest or bias or deception; conforming with established standards or rules | Synonyms: fair |
| (adjective) of moral excellence | Synonyms: good, upright |
| justifiable | (adjective) capable of being justified | - |
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| justificative | (adjective) attempting to justify or defend in speech or writing | Synonyms: defensive, justificatory |
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| (adjective) providing justification | Synonyms: justificatory, vindicatory |
| justificatory | (adjective) attempting to justify or defend in speech or writing | Synonyms: defensive, justificative |
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| (adjective) providing justification | Synonyms: justificative, vindicatory |
| justified | (adjective) having words so spaced that lines have straight even margins | - |
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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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| lackluster | (adjective) lacking luster or shine | Synonyms: lacklustre, lusterless, lustreless |
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| (adjective) lacking brilliance or vitality | Synonyms: lacklustre, lusterless, lustreless |
| lacklustre | (adjective) lacking luster or shine | Synonyms: lackluster, lusterless, lustreless |
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| (adjective) lacking brilliance or vitality | Synonyms: lackluster, lusterless, lustreless |
| lacustrine | (adjective) of or relating to or living near lakes | - |
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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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| lecherous | (adjective) given to excessive indulgence in sexual activity | - |
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| leguminous | (adjective) relating to or consisting of legumes | - |
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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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| 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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| 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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| 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 |
| 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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| lousy | (adjective) very bad | Synonyms: crappy, icky, rotten, shitty, stinking, stinky |
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| (adjective) infested with lice | - |
| (adjective) vile; despicable | Synonyms: dirty, filthy |
| lubricious | (adjective) characterized by lust | Synonyms: lustful, prurient, salacious |
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| (adjective) having a smooth or slippery quality | - |
| lucifugous | (adjective) light-avoiding | Synonyms: lucifugal |
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| ludicrous | (adjective) so unreasonable as to invite derision | Synonyms: absurd, cockeyed, derisory, idiotic, laughable, nonsensical, preposterous, ridiculous |
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| (adjective) broadly or extravagantly humorous; resembling farce | Synonyms: farcical, ridiculous |
| lugubrious | (adjective) excessively mournful | - |
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