| infrequent | (adjective) not frequent; not occurring regularly or at short intervals | - |
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| inhalant | (adjective) inhaling or serving for inhalation | - |
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| inherent | (adjective) in the nature of something though not readily apparent | Synonyms: implicit in, underlying |
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| (adjective) existing as an essential constituent or characteristic | Synonyms: built-in, constitutional, inbuilt, integral |
| innocent | (adjective) free from evil or guilt | Synonyms: clean-handed, guiltless |
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| (adjective) lacking intent or capacity to injure | Synonyms: innocuous |
| (adjective) lacking in sophistication or worldliness | Synonyms: ingenuous |
| (adjective) completely wanting or lacking | Synonyms: barren, destitute, devoid, free |
| (adjective) (used of things) lacking sense or awareness | - |
| (adjective) not knowledgeable about something specified | Synonyms: unacquainted |
| (adjective) free from sin | Synonyms: impeccant, sinless |
| insentient | (adjective) devoid of feeling and consciousness and animation | Synonyms: insensate |
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| insignificant | (adjective) devoid of importance, meaning, or force | Synonyms: unimportant |
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| (adjective) signifying nothing | - |
| (adjective) of little importance or influence or power; of minor status | Synonyms: peanut |
| (adjective) small and unimpressive | Synonyms: dinky |
| insistent | (adjective) repetitive and persistent | Synonyms: repetitive |
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| (adjective) demanding attention | Synonyms: clamant, crying, exigent, instant |
| insolent | (adjective) marked by casual disrespect | Synonyms: flip, impudent, snotty-nosed |
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| (adjective) unrestrained by convention or propriety | Synonyms: audacious, bald-faced, barefaced, bodacious, brassy, brazen-faced, brazen |
| insolvent | (adjective) unable to meet or discharge financial obligations | - |
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| insouciant | (adjective) marked by blithe unconcern | Synonyms: casual, nonchalant |
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| instant | (adjective) occurring with no delay | Synonyms: instantaneous |
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| (adjective) demanding attention | Synonyms: clamant, crying, exigent, insistent |
| (adjective) in or of the present month | Synonyms: inst |
| insufficient | (adjective) of a quantity not able to fulfill a need or requirement | Synonyms: deficient |
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| insurgent | (adjective) in opposition to a civil authority or government | Synonyms: seditious, subversive |
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| intelligent | (adjective) having the capacity for thought and reason especially to a high degree | - |
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| (adjective) endowed with the capacity to reason | Synonyms: reasoning, thinking |
| (adjective) exercising or showing good judgment | Synonyms: healthy, level-headed, levelheaded, sound |
| (adjective) possessing sound knowledge | Synonyms: well-informed |
| intent | (adjective) giving or marked by complete attention to | Synonyms: absorbed, captive, engrossed, enwrapped, rapt, wrapped |
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| interdependent | (adjective) mutually dependent | Synonyms: mutualist, mutually beneficial |
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| intermittent | (adjective) stopping and starting at irregular intervals | - |
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| intersectant | (adjective) crossed or intersected in the form of an X | Synonyms: decussate, intersecting |
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| intolerant | (adjective) unwilling to tolerate difference of opinion | - |
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| (adjective) narrow-minded about cherished opinions | Synonyms: illiberal |
| intoxicant | (adjective) causing intoxication | Synonyms: intoxicating |
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| intransigent | (adjective) impervious to pleas, persuasion, requests, reason | Synonyms: adamant, adamantine, inexorable |
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| intumescent | (adjective) abnormally distended especially by fluids or gas | Synonyms: bloated, distended, puffy, swollen, tumescent, tumid, turgid |
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| invariant | (adjective) unvarying in nature | Synonyms: changeless, constant, unvarying |
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| (adjective) unaffected by a designated operation or transformation | - |
| 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 |
| irrelevant | (adjective) having no bearing on or connection with the subject at issue | - |
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| irreverent | (adjective) showing lack of due respect or veneration | - |
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| (adjective) not revering god | Synonyms: godless |
| (adjective) characterized by a lightly pert and exuberant quality | Synonyms: impertinent, pert, saucy |
| itinerant | (adjective) traveling from place to place to work | - |
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| joint | (adjective) united or combined | - |
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| (adjective) involving both houses of a legislature | - |
| (adjective) affecting or involving two or more | - |
| jubilant | (adjective) joyful and proud especially because of triumph or success | Synonyms: exultant, exulting, prideful, rejoicing, triumphal, triumphant |
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| (adjective) full of high-spirited delight | Synonyms: elated, gleeful, joyful |
| lambent | (adjective) softly bright or radiant | Synonyms: aglow, lucent, luminous |
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| latent | (adjective) (pathology) not presently active | - |
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| (adjective) potentially existing but not presently evident or realized | - |
| lenient | (adjective) characterized by tolerance and mercy | - |
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| (adjective) tolerant or lenient | Synonyms: indulgent, soft |
| (adjective) not strict | Synonyms: easy |
| liquescent | (adjective) becoming liquid | Synonyms: melting |
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| lucent | (adjective) softly bright or radiant | Synonyms: aglow, lambent, luminous |
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| luculent | (adjective) (of language) transparently clear; easily understandable | Synonyms: crystal clear, limpid, lucid, pellucid, perspicuous |
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| luminescent | (adjective) emitting light not caused by heat | - |
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| luxuriant | (adjective) produced or growing in extreme abundance | Synonyms: exuberant, lush, profuse, riotous |
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| (adjective) marked by complexity and richness of detail | Synonyms: elaborate |
| (adjective) displaying luxury and furnishing gratification to the senses | Synonyms: epicurean, luxurious, sybaritic, voluptuary, voluptuous |
| magnificent | (adjective) characterized by grandeur | Synonyms: brilliant, glorious, splendid |
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| magniloquent | (adjective) lofty in style | Synonyms: grandiloquent, tall |
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| malcontent | (adjective) discontented as toward authority | Synonyms: disaffected, ill-affected, rebellious |
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| maleficent | (adjective) harmful or evil in intent or effect | - |
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| malevolent | (adjective) having or exerting a malignant influence | Synonyms: evil, malefic, malign |
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| (adjective) wishing or appearing to wish evil to others; arising from intense ill will or hatred | - |
| malignant | (adjective) dangerous to health; characterized by progressive and uncontrolled growth (especially of a tumor) | - |
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| mellisonant | (adjective) pleasing to the ear | Synonyms: dulcet, honeyed, mellifluous, sweet |
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| mendicant | (adjective) practicing beggary | - |
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| migrant | (adjective) habitually moving from place to place especially in search of seasonal work | Synonyms: migratory |
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| militant | (adjective) showing a fighting disposition | Synonyms: competitive |
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| (adjective) disposed to warfare or hard-line policies | Synonyms: hawkish, warlike |
| (adjective) engaged in war | Synonyms: belligerent, war-ridden, warring |
| ministrant | (adjective) giving practical help to | Synonyms: attending |
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| mint | (adjective) as if new | - |
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| monovalent | (adjective) having a valence of 1 | Synonyms: univalent |
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| (adjective) containing only one kind of antibody | - |
| mordant | (adjective) of a substance, especially a strong acid; capable of destroying or eating away by chemical action | Synonyms: caustic, corrosive, erosive, vitriolic |
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| (adjective) harshly ironic or sinister | Synonyms: black, grim |
| mucopurulent | (adjective) containing or composed of mucus and pus | - |
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| multipotent | (adjective) able to many things | - |
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| multivalent | (adjective) used of the association of three or more homologous chromosomes during the first division of meiosis | - |
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| (adjective) having more than one valence, or having a valence of 3 or higher | Synonyms: polyvalent |
| (adjective) having many values, meanings, or appeals | Synonyms: multi-valued |
| munificent | (adjective) very generous | Synonyms: lavish, overgenerous, too-generous, unsparing, unstinted, unstinting |
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| mutafacient | (adjective) capable of inducing mutation (used mainly of intracellular agents) | - |
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| mutant | (adjective) tending to undergo or resulting from mutation | - |
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| naiant | (adjective) applied to a fish depicted horizontally | Synonyms: swimming |
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| nascent | (adjective) being born or beginning | - |
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| negligent | (adjective) characterized by neglect and undue lack of concern | - |
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| nescient | (adjective) holding that only material phenomena can be known and knowledge of spiritual matters or ultimate causes is impossible | Synonyms: unbelieving |
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| (adjective) uneducated in general; lacking knowledge or sophistication | Synonyms: ignorant, unlearned, unlettered |
| nilpotent | (adjective) equal to zero when raised to a certain power | - |
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| nocent | (adjective) having a tendency to cause harm | - |
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| noctilucent | (adjective) shining or glowing by night | - |
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| nonabsorbent | (adjective) not capable of absorbing or soaking up (liquids) | Synonyms: nonabsorptive |
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| nonadjacent | (adjective) not adjacent; not next | - |
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| nonadsorbent | (adjective) lacking a capacity to adsorb or cause to accumulate on a surface | Synonyms: nonadsorptive |
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| nonastringent | (adjective) not astringent | - |
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| nonbelligerent | (adjective) not directly at war | - |
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| nonchalant | (adjective) marked by blithe unconcern | Synonyms: casual, insouciant |
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| noncombatant | (adjective) member of armed forces whose duties do not include fighting as e.g. a chaplain or surgeon | - |
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| (adjective) used of civilians in time of war | - |
| noncompliant | (adjective) boldly resisting authority or an opposing force | Synonyms: defiant |
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| nonconvergent | (adjective) (of lines, planes, or surfaces) never meeting or crossing | Synonyms: nonintersecting |
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| noncurrent | (adjective) not current or belonging to the present time | - |
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| noneffervescent | (adjective) not effervescent | - |
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| (adjective) not sparkling | Synonyms: still |
| nonequivalent | (adjective) not equal or interchangeable in value, quantity, or significance | - |
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| nonexistent | (adjective) not having existence or being or actuality | - |
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| nonextant | (adjective) no longer in existence; lost or especially having died out leaving no living representatives | Synonyms: extinct |
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| (adjective) no longer existing or inaccessible through loss or destruction | - |
| nonindulgent | (adjective) characterized by strictness, severity, or restraint | Synonyms: strict |
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| nonobservant | (adjective) failing or refusing to observe religious customs | - |
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| nonpregnant | (adjective) not pregnant | - |
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| nonpurulent | (adjective) not containing pus | - |
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| nonresident | (adjective) not living in a particular place or owned by permanent residents | - |
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| nonresilient | (adjective) not resilient | - |
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| nonresistant | (adjective) offering no resistance, compliant | - |
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| (adjective) (often followed by `to') likely to be affected with | Synonyms: liable, nonimmune, unresistant |
| nonresonant | (adjective) not reverberant; lacking a tendency to reverberate | Synonyms: unreverberant |
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| nonruminant | (adjective) not ruminant | - |
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| nonsignificant | (adjective) attributable to chance | - |
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| nonturbulent | (adjective) (of a liquid) not turbulent | - |
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| nonviolent | (adjective) abstaining (on principle) from the use of violence | - |
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| (adjective) achieved without bloodshed | Synonyms: unbloody |
| nurturant | (adjective) providing physical and emotional care and nourishment | - |
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| nutrient | (adjective) of or providing nourishment | Synonyms: alimental, alimentary, nourishing, nutritious, nutritive |
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| obedient | (adjective) dutifully complying with the commands or instructions of those in authority | - |
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| observant | (adjective) paying close attention especially to details | - |
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| (adjective) (of individuals) adhering strictly to laws and rules and customs | Synonyms: law-abiding |
| (adjective) quick to notice; showing quick and keen perception | Synonyms: observing |
| obsolescent | (adjective) becoming obsolete | - |
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| occurrent | (adjective) presently occurring (either causally or incidentally) | - |
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| omnipotent | (adjective) having unlimited power | Synonyms: all-powerful, almighty |
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| omnipresent | (adjective) being present everywhere at once | Synonyms: ubiquitous |
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| omniscient | (adjective) infinitely wise | Synonyms: all-knowing |
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| opalescent | (adjective) having a play of lustrous rainbow colors | Synonyms: iridescent, nacreous, opaline, pearlescent |
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