| incompressible | (adjective) incapable of being compressed; resisting compression | - |
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| incomputable | (adjective) beyond calculation or measure | Synonyms: immeasurable, inestimable |
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| indomitable | (adjective) impossible to subdue | Synonyms: never-say-die, unsubduable |
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| inhomogeneous | (adjective) not homogeneous | Synonyms: nonuniform |
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| insomniac | (adjective) experiencing or accompanied by sleeplessness | Synonyms: sleepless, watchful |
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| interdenominational | (adjective) occurring between or among or common to different churches or denominations | Synonyms: interchurch |
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| irksome | (adjective) so lacking in interest as to cause mental weariness | Synonyms: boring, deadening, dull, ho-hum, slow, tedious, tiresome, wearisome |
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| isomeric | (adjective) of or relating to or exhibiting isomerism | - |
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| isometric | (adjective) of or involving muscular contraction in which tension increases while length remains constant | - |
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| (adjective) related by an isometry | - |
| (adjective) of a crystal system characterized by three equal axes at right angles | - |
| (adjective) having equal dimensions or measurements | Synonyms: isometrical |
| isometrical | (adjective) having equal dimensions or measurements | Synonyms: isometric |
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| isomorphic | (adjective) having similar appearance but genetically different | Synonyms: isomorphous |
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| isomorphous | (adjective) having similar appearance but genetically different | Synonyms: isomorphic |
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| lightsome | (adjective) carefree and happy and lighthearted | Synonyms: blithe, blithesome, light-hearted, lighthearted |
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| (adjective) moving easily and quickly; nimble | Synonyms: light, tripping |
| lissom | (adjective) gracefully thin and bending and moving with ease | Synonyms: lissome, lithe, lithesome, sinuous, supple |
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| lissome | (adjective) gracefully thin and bending and moving with ease | Synonyms: lissom, lithe, lithesome, sinuous, supple |
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| lithesome | (adjective) gracefully thin and bending and moving with ease | Synonyms: lissom, lissome, lithe, sinuous, supple |
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| lithomantic | (adjective) of or relating to lithomancy | - |
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| loathsome | (adjective) highly offensive; arousing aversion or disgust | Synonyms: disgustful, disgusting, distasteful, foul, loathly, repellant, repellent, repelling, revolting, skanky, wicked, yucky |
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| (adjective) causing or able to cause nausea | Synonyms: nauseating, nauseous, noisome, offensive, queasy, sickening, vile |
| locomotive | (adjective) of or relating to locomotion | Synonyms: locomotor |
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| locomotor | (adjective) of or relating to locomotion | Synonyms: locomotive |
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| lonesome | (adjective) marked by dejection from being alone | Synonyms: lonely |
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| (adjective) being the only one; single and isolated from others | Synonyms: lone, only, sole, solitary |
| lovesome | (adjective) having or displaying warmth or affection | Synonyms: affectionate, fond, tender |
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| macroeconomic | (adjective) of or relating to macroeconomics | - |
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| macromolecular | (adjective) relating to or consisting of or characterized by macromolecules | - |
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| maxillomandibular | (adjective) relating to the upper and lower jaws | - |
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| meddlesome | (adjective) intrusive in a meddling or offensive manner | Synonyms: busy, busybodied, interfering, meddling, officious |
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| megalomaniacal | (adjective) suffering from megalomania | Synonyms: megalomanic |
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| megalomanic | (adjective) suffering from megalomania | Synonyms: megalomaniacal |
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| mesomorphic | (adjective) having a robust muscular body-build characterized by predominance of structures (bone and muscle and connective tissue) developed from the embryonic mesodermal layer | Synonyms: muscular |
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| mettlesome | (adjective) willing to face danger | Synonyms: game, gamey, gamy, gritty, spirited, spunky |
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| (adjective) having a proud and unbroken spirit | - |
| microeconomic | (adjective) of or relating to microeconomics | - |
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| micrometeoric | (adjective) of or relating to micrometeoroids | Synonyms: micrometeoritic |
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| micrometeoritic | (adjective) of or relating to micrometeoroids | Synonyms: micrometeoric |
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| microsomal | (adjective) of or relating to microsomes | - |
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| momentaneous | (adjective) lasting for a markedly brief time | Synonyms: fleeting, fugitive, momentary |
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| momentary | (adjective) lasting for a markedly brief time | Synonyms: fleeting, fugitive, momentaneous |
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| momentous | (adjective) of very great significance | - |
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| monatomic | (adjective) of or relating to an element consisting of a single atom | Synonyms: monoatomic |
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| monoatomic | (adjective) of or relating to an element consisting of a single atom | Synonyms: monatomic |
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| monochromatic | (adjective) (of light or other electromagnetic radiation) having only one wavelength | Synonyms: homochromatic |
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| (adjective) of or relating to monochromatism | - |
| (adjective) having or appearing to have only one color | Synonyms: monochrome, monochromic, monochromous |
| monochrome | (adjective) having or appearing to have only one color | Synonyms: monochromatic, monochromic, monochromous |
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| monochromic | (adjective) having or appearing to have only one color | Synonyms: monochromatic, monochrome, monochromous |
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| monochromous | (adjective) having or appearing to have only one color | Synonyms: monochromatic, monochrome, monochromic |
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| monomaniacal | (adjective) obsessed with a single subject or idea | - |
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| monometallic | (adjective) containing one atom of metal in the molecule | - |
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| monomorphemic | (adjective) consisting of only one morpheme | - |
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| multinomial | (adjective) having the character of a polynomial | Synonyms: polynomial |
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| necromantic | (adjective) relating to or associated with necromancy | Synonyms: necromantical |
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| (adjective) given to or produced by or used in the art of conjuring up the dead | - |
| necromantical | (adjective) relating to or associated with necromancy | Synonyms: necromantic |
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| nettlesome | (adjective) causing irritation or annoyance | Synonyms: annoying, bothersome, galling, irritating, pesky, pestering, pestiferous, plaguey, plaguy, teasing, vexatious, vexing |
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| (adjective) easily irritated or annoyed | Synonyms: cranky, fractious, irritable, peckish, peevish, pettish, petulant, scratchy, techy, testy, tetchy |
| neuroanatomic | (adjective) of or relating to neural tissue or the nervous system | Synonyms: neuroanatomical |
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| neuroanatomical | (adjective) of or relating to neural tissue or the nervous system | Synonyms: neuroanatomic |
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| neuromatous | (adjective) of or relating to or caused by neuromas | - |
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| neuromotor | (adjective) relating to a nerve fiber or impulse passing toward motor effectors | - |
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| neuromuscular | (adjective) affecting or characteristic of both neural and muscular tissue | - |
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| noisome | (adjective) offensively malodorous | Synonyms: fetid, foetid, foul-smelling, foul, funky, ill-scented, smelly, stinking |
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| (adjective) causing or able to cause nausea | Synonyms: loathsome, nauseating, nauseous, offensive, queasy, sickening, vile |
| nomadic | (adjective) migratory | Synonyms: mobile, peregrine, roving, wandering |
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| nominal | (adjective) of, relating to, or characteristic of an amount that is not adjusted for inflation | - |
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| (adjective) pertaining to a noun or to a word group that functions as a noun | - |
| (adjective) relating to or constituting or bearing or giving a name | - |
| (adjective) existing in name only | Synonyms: titular |
| (adjective) insignificantly small; a matter of form only (`tokenish' is informal) | Synonyms: token, tokenish |
| (adjective) named; bearing the name of a specific person | Synonyms: nominative |
| nominalistic | (adjective) of or relating to nominalism | - |
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| nominated | (adjective) appointed by nomination | Synonyms: nominative |
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| nominative | (adjective) serving as or indicating the subject of a verb and words identified with the subject of a copular verb | - |
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| (adjective) appointed by nomination | Synonyms: nominated |
| (adjective) named; bearing the name of a specific person | Synonyms: nominal |
| nomothetic | (adjective) relating to or involving the search for abstract universal principles | - |
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| nonautonomous | (adjective) (of peoples and political bodies) controlled by outside forces | Synonyms: nonsovereign |
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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 | - |
| noncombinative | (adjective) not involving combination | - |
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| noncombining | (adjective) not able to combine | - |
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| noncombustible | (adjective) not capable of igniting and burning | Synonyms: incombustible |
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| noncommercial | (adjective) not connected with or engaged in commercial enterprises | - |
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| noncommissioned | (adjective) (of military officers) appointed from enlisted personnel | - |
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| noncommittal | (adjective) refusing to bind oneself to a particular course of action or view or the like | - |
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| noncommunicable | (adjective) (of disease) not capable of being passed on | Synonyms: noncontagious, nontransmissible |
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| noncompetitive | (adjective) not involving competition or competitiveness | - |
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| noncompliant | (adjective) boldly resisting authority or an opposing force | Synonyms: defiant |
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| noncomprehensive | (adjective) not comprehensive | Synonyms: incomprehensive |
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| nondenominational | (adjective) not restricted to a particular religious denomination | - |
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| nonnomadic | (adjective) not nomadic or wandering | - |
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| nonrandom | (adjective) not random | - |
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| nonvenomous | (adjective) not producing venom | - |
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| nosocomial | (adjective) taking place or originating in a hospital | - |
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| nymphomaniac | (adjective) (used of women) affected with excessive sexual desire | Synonyms: nymphomaniacal |
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| nymphomaniacal | (adjective) (used of women) affected with excessive sexual desire | Synonyms: nymphomaniac |
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| ominous | (adjective) threatening or foreshadowing evil or tragic developments | Synonyms: baleful, forbidding, menacing, minacious, minatory, sinister, threatening |
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| (adjective) presaging ill fortune | Synonyms: ill, inauspicious |
| omissible | (adjective) capable of being left out | - |
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| omissive | (adjective) characterized by omissions | - |
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| omnibus | (adjective) providing for many things at once | - |
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| omnidirectional | (adjective) not directional | - |
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| omnifarious | (adjective) of all varieties or forms or kinds | - |
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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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| omnivorous | (adjective) feeding on both plants and animals | - |
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| oncoming | (adjective) moving toward one | - |
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| onomastic | (adjective) of or related to onomastics | - |
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| onomatopoeic | (adjective) (of words) formed in imitation of a natural sound | Synonyms: echoic, imitative, onomatopoeical, onomatopoetic |
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| (adjective) of or relating to or characterized by onomatopoeia | Synonyms: onomatopoetic |
| onomatopoeical | (adjective) (of words) formed in imitation of a natural sound | Synonyms: echoic, imitative, onomatopoeic, onomatopoetic |
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| onomatopoetic | (adjective) (of words) formed in imitation of a natural sound | Synonyms: echoic, imitative, onomatopoeic, onomatopoeical |
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| (adjective) of or relating to or characterized by onomatopoeia | Synonyms: onomatopoeic |
| orthomolecular | (adjective) designating or relating to a form of treatment of mental disorders that seeks to restore biochemical balance in the body with large doses of vitamins and minerals | - |
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| parasympathomimetic | (adjective) having an effect similar to that resulting from stimulation of the parasympathetic nervous system | - |
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| phantom | (adjective) something apparently sensed but having no physical reality | - |
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| phenomenal | (adjective) of or relating to a phenomenon | - |
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| (adjective) extraordinarily good or great; used especially as intensifiers | Synonyms: fantastic, grand, howling, marvellous, marvelous, rattling, terrific, tremendous, wonderful, wondrous |