| invariant | (adjective) unvarying in nature | Synonyms: changeless, constant, unvarying |
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| (adjective) unaffected by a designated operation or transformation | - |
| irrelevant | (adjective) having no bearing on or connection with the subject at issue | - |
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| isopteran | (adjective) relating to or characteristic of insects of the order Isoptera | - |
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| isthmian | (adjective) of or relating to or forming an isthmus | - |
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| itinerant | (adjective) traveling from place to place to work | - |
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| jangling | (adjective) like the discordant ringing of nonmusical metallic objects striking together | Synonyms: jangly |
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| jangly | (adjective) like the discordant ringing of nonmusical metallic objects striking together | Synonyms: jangling |
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| 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 |
| labyrinthian | (adjective) resembling a labyrinth in form or complexity | Synonyms: labyrinthine, mazy |
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| lacertilian | (adjective) of or relating to lizards | Synonyms: saurian |
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| lamellibranch | (adjective) bivalve | Synonyms: pelecypod, pelecypodous |
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| lanate | (adjective) covered with dense cottony hairs or hairlike filaments | Synonyms: woolly |
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| lancelike | (adjective) (of a leaf shape) shaped like a lance head; narrow and tapering to a pointed apex | Synonyms: lanceolate |
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| lanceolate | (adjective) (of a leaf shape) shaped like a lance head; narrow and tapering to a pointed apex | Synonyms: lancelike |
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| lancinate | (adjective) painful as if caused by a sharp instrument | Synonyms: cutting, keen, knifelike, lancinating, piercing, stabbing |
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| lancinating | (adjective) painful as if caused by a sharp instrument | Synonyms: cutting, keen, knifelike, lancinate, piercing, stabbing |
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| landed | (adjective) owning or consisting of land or real estate | - |
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| landless | (adjective) owning no land | - |
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| landlocked | (adjective) surrounded entirely or almost entirely by land | - |
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| landlubberly | (adjective) inexperienced in seamanship | Synonyms: lubberly |
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| landscaped | (adjective) (of land) improved by gardening or landscape architecture | - |
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| languid | (adjective) lacking spirit or liveliness | Synonyms: dreamy, lackadaisical, languorous |
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| languorous | (adjective) lacking spirit or liveliness | Synonyms: dreamy, lackadaisical, languid |
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| laniary | (adjective) of or relating to a pointed conical tooth | Synonyms: canine |
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| lank | (adjective) long and thin and often limp | - |
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| (adjective) long and lean | Synonyms: spindly |
| lanky | (adjective) tall and thin and having long slender limbs | Synonyms: gangling, gangly, rangy |
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| (adjective) tall and thin | Synonyms: gangling, gangly |
| lapidarian | (adjective) inscribed on stone | - |
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| latitudinarian | (adjective) unwilling to accept authority or dogma (especially in religion) | Synonyms: free-thinking, undogmatic, undogmatical |
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| lean | (adjective) lacking in mineral content or combustible material | - |
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| (adjective) lacking excess flesh | Synonyms: thin |
| (adjective) not profitable or prosperous | - |
| (adjective) containing little excess | Synonyms: skimpy |
| leaning | (adjective) departing or being caused to depart from the true vertical or horizontal | Synonyms: atilt, canted, tilted, tipped |
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| leptorrhinian | (adjective) having a long narrow nose | Synonyms: leptorhine, leptorrhine, leptorrhinic |
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| leptosporangiate | (adjective) (of ferns) having each sporangium formed from a single epidermal cell | - |
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| lesbian | (adjective) of or relating to or characterized by homosexual relations between woman | Synonyms: sapphic |
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| lilliputian | (adjective) very small | Synonyms: bantam, diminutive, flyspeck, midget, petite, tiny |
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| (adjective) (informal) small and of little importance | Synonyms: fiddling, footling, little, niggling, petty, picayune, piddling, piffling, trivial |
| lithomantic | (adjective) of or relating to lithomancy | - |
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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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| longhand | (adjective) having words written out in full by hand | - |
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| longstanding | (adjective) having existed for a long time | Synonyms: long-standing |
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| lowland | (adjective) of relatively low or level country | - |
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| lucullan | (adjective) characterized by extravagance and profusion | Synonyms: lavish, plush, plushy |
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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 |
| magnanimous | (adjective) generous and understanding and tolerant | Synonyms: big, large |
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| (adjective) noble and generous in spirit | Synonyms: greathearted |
| malignant | (adjective) dangerous to health; characterized by progressive and uncontrolled growth (especially of a tumor) | - |
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| mammalian | (adjective) of or relating to the class Mammalia | - |
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| manageable | (adjective) capable of being managed or controlled | - |
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| (adjective) capable of existing or taking place or proving true; possible to do | Synonyms: accomplishable, achievable, doable, realizable |
| managerial | (adjective) of or relating to the function or responsibility or activity of management | - |
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| mandatory | (adjective) required by rule | Synonyms: compulsory, required |
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| mandibular | (adjective) relating to the lower jaw | Synonyms: inframaxillary |
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| mandibulate | (adjective) having mandibles | - |
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| mandibulofacial | (adjective) of or relating to the lower jaw and face | - |
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| maneuverable | (adjective) capable of maneuvering or changing position | Synonyms: manoeuvrable |
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| manful | (adjective) possessing qualities befitting a man | Synonyms: manlike, manly |
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| (adjective) characteristic of a man | Synonyms: male, manlike, manly, virile |
| mangey | (adjective) having many worn or threadbare spots in the nap | Synonyms: mangy |
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| mangled | (adjective) having edges that are jagged from injury | Synonyms: lacerate, lacerated, torn |
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| mangy | (adjective) having many worn or threadbare spots in the nap | Synonyms: mangey |
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| maniac | (adjective) wildly disordered | Synonyms: maniacal |
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| maniacal | (adjective) wildly disordered | Synonyms: maniac |
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| manic | (adjective) affected with or marked by frenzy or mania uncontrolled by reason | Synonyms: frenzied |
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| maniclike | (adjective) resembling the mania of manic-depressive illness | - |
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| manifest | (adjective) clearly revealed to the mind or the senses or judgment | Synonyms: apparent, evident, palpable, patent, plain, unmistakable |
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| manifold | (adjective) many and varied; having many features or forms | Synonyms: multiplex |
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| manipulable | (adjective) easily managed (controlled or taught or molded) | Synonyms: tractable |
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| manipulative | (adjective) skillful in influencing or controlling others to your own advantage | - |
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| manky | (adjective) inferior and worthless | - |
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| manlike | (adjective) possessing qualities befitting a man | Synonyms: manful, manly |
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| (adjective) resembling human beings | Synonyms: anthropoid |
| (adjective) characteristic of a man | Synonyms: male, manful, manly, virile |
| manly | (adjective) possessing qualities befitting a man | Synonyms: manful, manlike |
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| (adjective) characteristic of a man | Synonyms: male, manful, manlike, virile |
| manned | (adjective) having a crew | - |
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| mannered | (adjective) having unnatural mannerisms | - |
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| mannerly | (adjective) socially correct in behavior | Synonyms: well-mannered |
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| mannish | (adjective) characteristic of a man as distinguished from a woman | - |
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| (adjective) resembling or imitative of or suggestive of a man rather than a woman | - |
| manoeuvrable | (adjective) capable of maneuvering or changing position | Synonyms: maneuverable |
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| manorial | (adjective) of or relating to or based on the manor | - |
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| manque | (adjective) unfulfilled or frustrated in realizing an ambition | Synonyms: would-be |
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| mansard | (adjective) (of a roof) having two slopes on all sides with the lower slope steeper than the upper | - |
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| mantic | (adjective) resembling or characteristic of a prophet or prophecy | Synonyms: divinatory, sibyllic, sibylline, vatic, vatical |
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| mantled | (adjective) covered with or as if with clothes or a wrap or cloak | Synonyms: cloaked, clothed, draped, wrapped |
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| manual | (adjective) requiring human effort | - |
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| (adjective) of or relating to the hands | - |
| (adjective) doing or requiring physical work | - |
| manufactured | (adjective) produced in a large-scale industrial operation | - |
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| many | (adjective) a quantifier that can be used with count nouns and is often preceded by `as' or `too' or `so' or `that'; amounting to a large but indefinite number; quantifier, plural pronoun; quantifier, plural | - |
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| marmorean | (adjective) of or relating to or characteristic of marble | Synonyms: marmoreal |
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| maxillomandibular | (adjective) relating to the upper and lower jaws | - |
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| mean | (adjective) of no value or worth | Synonyms: bastardly |
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| (adjective) having or showing an ignoble lack of honor or morality | Synonyms: base, meanspirited |
| (adjective) characterized by malice | Synonyms: hateful |
| (adjective) approximating the statistical norm or average or expected value | Synonyms: average |
| (adjective) marked by poverty befitting a beggar | Synonyms: beggarly |
| (adjective) (used of sums of money) so small in amount as to deserve contempt | Synonyms: beggarly |
| (adjective) (used of persons or behavior) characterized by or indicative of lack of generosity | Synonyms: mingy, miserly, tight |
| (adjective) very good; of the highest quality | Synonyms: excellent, fantabulous, first-class, ripping, splendid |
| meandering | (adjective) of a path e.g. | Synonyms: rambling, wandering, winding |
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| meaning | (adjective) rich in significance or implication | Synonyms: pregnant, significant |
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| meaningful | (adjective) having a meaning or purpose | - |
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| meaningless | (adjective) having no meaning or direction or purpose | Synonyms: nonmeaningful |
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| (adjective) producing no result or effect | Synonyms: futile, ineffectual, otiose, unavailing |
| meanspirited | (adjective) lacking in magnanimity | Synonyms: ungenerous |
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| (adjective) having or showing an ignoble lack of honor or morality | Synonyms: base, mean |
| mechanic | (adjective) resembling the action of a machine | - |
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| mechanical | (adjective) using (or as if using) mechanisms or tools or devices | - |
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| (adjective) relating to or governed by or in accordance with mechanics | - |
| (adjective) relating to or concerned with machinery or tools | Synonyms: mechanically skillful, technical |
| mechanised | (adjective) equipped with machinery | Synonyms: mechanized |
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| (adjective) using vehicles | Synonyms: mechanized, motorized |
| mechanistic | (adjective) of or relating to the philosophical theory of mechanism | - |
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| (adjective) explained in terms of physical forces | - |
| mechanized | (adjective) equipped with machinery | Synonyms: mechanised |
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| (adjective) using vehicles | Synonyms: mechanised, motorized |
| median | (adjective) relating to or situated in or extending toward the middle | Synonyms: medial |
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| (adjective) dividing an animal into right and left halves | Synonyms: medial |
| (adjective) relating to or constituting the middle value of an ordered set of values (or the average of the middle two in a set with an even number of values) | Synonyms: average |
| megalomaniacal | (adjective) suffering from megalomania | Synonyms: megalomanic |
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| megalomanic | (adjective) suffering from megalomania | Synonyms: megalomaniacal |
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| melancholic | (adjective) characterized by or causing or expressing sadness | Synonyms: melancholy |
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| melancholy | (adjective) grave or even gloomy in character | Synonyms: somber, sombre |
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| (adjective) characterized by or causing or expressing sadness | Synonyms: melancholic |
| mellisonant | (adjective) pleasing to the ear | Synonyms: dulcet, honeyed, mellifluous, sweet |
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| membranous | (adjective) relating to or made of or similar to a membrane | - |
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| (adjective) characterized by formation of a membrane (or something resembling a membrane) | Synonyms: membrane-forming |
| mendicant | (adjective) practicing beggary | - |
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