| adulterous | (adjective) characterized by adultery | Synonyms: extracurricular, extramarital |
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| (adjective) not faithful to a spouse or lover | Synonyms: cheating, two-timing |
| adumbrative | (adjective) indistinctly prophetic | Synonyms: foreshadowing, prefigurative |
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| adust | (adjective) burned brown by the sun | - |
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| (adjective) dried out by heat or excessive exposure to sunlight | Synonyms: baked, parched, scorched, sunbaked |
| advantageous | (adjective) giving an advantage | Synonyms: favorable, favourable |
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| (adjective) appropriate for achieving a particular end; implies a lack of concern for fairness | - |
| advective | (adjective) of or relating to advection | - |
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| adventitial | (adjective) of or pertaining to the adventitia | - |
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| adventitious | (adjective) associated by chance and not an integral part | - |
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| adventive | (adjective) not native and not fully established; locally or temporarily naturalized | - |
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| adventuresome | (adjective) willing to undertake or seeking out new and daring enterprises | Synonyms: adventurous |
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| adventuristic | (adjective) of or pertaining to adventurism | - |
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| adventurous | (adjective) willing to undertake or seeking out new and daring enterprises | Synonyms: adventuresome |
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| adversative | (adjective) expressing antithesis or opposition | Synonyms: oppositive |
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| advertent | (adjective) giving attention | Synonyms: heedful |
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| advertised | (adjective) called to public attention | - |
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| aeolotropic | (adjective) having properties with different values along different axes | Synonyms: eolotropic |
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| aerated | (adjective) supplied with carbon dioxide | Synonyms: charged |
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| (adjective) (of a liquid) treated by having air passed or bubbled through it for purification | - |
| aerobiotic | (adjective) living or active only in the presence of oxygen | - |
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| aerolitic | (adjective) of or pertaining to certain stony meteorites | - |
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| aeronautic | (adjective) of or pertaining to aeronautics | Synonyms: aeronautical |
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| aeronautical | (adjective) of or pertaining to aeronautics | Synonyms: aeronautic |
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| aerophilatelic | (adjective) of or relating to airmail stamps | - |
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| aesthetic | (adjective) concerning or characterized by an appreciation of beauty or good taste | Synonyms: aesthetical, esthetic, esthetical |
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| (adjective) relating to or dealing with the subject of aesthetics | Synonyms: esthetic |
| (adjective) aesthetically pleasing | Synonyms: artistic, esthetic |
| aesthetical | (adjective) concerning or characterized by an appreciation of beauty or good taste | Synonyms: aesthetic, esthetic, esthetical |
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| aestival | (adjective) (rare) of or occurring in summer | Synonyms: estival |
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| aetiologic | (adjective) relating to the etiology of a disease | Synonyms: aetiological, etiologic, etiological |
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| (adjective) of or relating to the philosophical study of causation | Synonyms: aetiological, etiologic, etiological |
| aetiological | (adjective) relating to the etiology of a disease | Synonyms: aetiologic, etiologic, etiological |
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| (adjective) of or relating to the philosophical study of causation | Synonyms: aetiologic, etiologic, etiological |
| affected | (adjective) acted upon; influenced | - |
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| (adjective) speaking or behaving in an artificial way to make an impression | Synonyms: unnatural |
| (adjective) being excited or provoked to the expression of an emotion | Synonyms: moved, stirred, touched |
| affecting | (adjective) arousing affect | Synonyms: poignant, touching |
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| affectional | (adjective) characterized by emotion | Synonyms: affective, emotive |
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| affectionate | (adjective) having or displaying warmth or affection | Synonyms: fond, lovesome, tender |
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| affective | (adjective) characterized by emotion | Synonyms: affectional, emotive |
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| afferent | (adjective) of nerves and nerve impulses; conveying sensory information from the sense organs to the CNS | - |
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| affiliated | (adjective) being joined in close association | Synonyms: attached, connected |
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| affirmative | (adjective) affirming or giving assent | Synonyms: affirmatory |
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| (adjective) expressing or manifesting praise or approval | Synonyms: approbative, approbatory, approving, plausive |
| (adjective) expecting the best | Synonyms: optimistic |
| affirmatory | (adjective) affirming or giving assent | Synonyms: affirmative |
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| afflicted | (adjective) grievously affected especially by disease | Synonyms: stricken |
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| (adjective) mentally or physically unfit | Synonyms: impaired |
| afflictive | (adjective) causing misery or pain or distress | Synonyms: painful, sore |
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| affluent | (adjective) having an abundant supply of money or possessions of value | Synonyms: flush, loaded, moneyed, substantial, wealthy |
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| afloat | (adjective) borne on the water; floating | - |
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| (adjective) covered with water | Synonyms: awash, flooded, inundated, overflowing |
| (adjective) aimlessly drifting | Synonyms: adrift, aimless, directionless, planless, rudderless, undirected |
| aflutter | (adjective) excited in anticipation | Synonyms: nervous |
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| afoot | (adjective) currently in progress | Synonyms: underway |
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| (adjective) traveling by foot | - |
| aforementioned | (adjective) being the one previously mentioned or spoken of | Synonyms: aforesaid, said |
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| aforethought | (adjective) with planning and intention | Synonyms: planned, plotted |
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| aft | (adjective) (nautical, aeronautical) situated at or toward the stern or tail | - |
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| after | (adjective) located farther aft | - |
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| aftermost | (adjective) located closest to the stern or tail | - |
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| aftershafted | (adjective) having an aftershaft (a small feather at the base of some feathers) | - |
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| agamogenetic | (adjective) (of reproduction) not involving the fusion of male and female gametes in reproduction | Synonyms: agamic, agamous, apomictic, parthenogenetic |
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| agential | (adjective) of or relating to an agent or agency | - |
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| agglomerate | (adjective) clustered together but not coherent | Synonyms: agglomerated, agglomerative, clustered |
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| agglomerated | (adjective) clustered together but not coherent | Synonyms: agglomerate, agglomerative, clustered |
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| agglomerative | (adjective) clustered together but not coherent | Synonyms: agglomerate, agglomerated, clustered |
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| agglutinate | (adjective) united as if by glue | Synonyms: agglutinative |
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| agglutinative | (adjective) united as if by glue | Synonyms: agglutinate |
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| (adjective) forming derivative or compound words by putting together constituents each of which expresses a single definite meaning | Synonyms: polysynthetic |
| aggravated | (adjective) incited, especially deliberately, to anger | Synonyms: provoked |
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| (adjective) made more severe or intense especially in law | - |
| aggravating | (adjective) making worse | Synonyms: exacerbating, exasperating |
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| aggregate | (adjective) composed of a dense cluster of separate units such as carpels or florets or drupelets | - |
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| (adjective) formed of separate units gathered into a mass or whole | Synonyms: aggregated, aggregative, mass |
| aggregated | (adjective) formed of separate units gathered into a mass or whole | Synonyms: aggregate, aggregative, mass |
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| aggregative | (adjective) formed of separate units gathered into a mass or whole | Synonyms: aggregate, aggregated, mass |
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| aghast | (adjective) struck with fear, dread, or consternation | Synonyms: appalled, dismayed, shocked |
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| agitated | (adjective) troubled emotionally and usually deeply | - |
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| (adjective) physically disturbed or set in motion | - |
| agitating | (adjective) causing or tending to cause anger or resentment | Synonyms: agitative, provoking |
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| agitative | (adjective) causing or tending to cause anger or resentment | Synonyms: agitating, provoking |
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| aglitter | (adjective) having brief brilliant points or flashes of light | Synonyms: coruscant, fulgid, glinting, glistering, glittering, glittery, scintillant, scintillating, sparkly |
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| agnate | (adjective) related on the father's side | Synonyms: agnatic, paternal |
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| agnatic | (adjective) related on the father's side | Synonyms: agnate, paternal |
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| agnostic | (adjective) uncertain of all claims to knowledge | Synonyms: agnostical |
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| (adjective) of or pertaining to an agnostic or agnosticism | - |
| agnostical | (adjective) uncertain of all claims to knowledge | Synonyms: agnostic |
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| agonistic | (adjective) of or relating to the athletic contests held in ancient Greece | - |
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| (adjective) struggling for effect | Synonyms: strained |
| (adjective) striving to overcome in argument | Synonyms: agonistical, combative |
| agonistical | (adjective) striving to overcome in argument | Synonyms: agonistic, combative |
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| agranulocytic | (adjective) relating to the blood disorder of agranulocytosis | - |
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| agrestic | (adjective) characteristic of the fields or country | Synonyms: rustic |
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| (adjective) (of behavior) rustic and uncouth | - |
| agricultural | (adjective) relating to or used in or promoting agriculture or farming | - |
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| (adjective) relating to farming or agriculture | Synonyms: agrarian, farming |
| agrypnotic | (adjective) of or pertaining to agrypnia | - |
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| ahistorical | (adjective) unconcerned with or unrelated to history or to historical development or to tradition | - |
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| airtight | (adjective) having no weak points | Synonyms: air-tight |
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| (adjective) not allowing air or gas to pass in or out | Synonyms: air-tight, gas-tight |
| airworthy | (adjective) (of aircraft) fit to fly | - |
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| alabaster | (adjective) of or resembling alabaster | Synonyms: alabastrine |
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| alabastrine | (adjective) of or resembling alabaster | Synonyms: alabaster |
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| alacritous | (adjective) quick and eager | - |
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| alate | (adjective) (of seeds or insects) having winglike extensions | Synonyms: alated |
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| alated | (adjective) (of seeds or insects) having winglike extensions | Synonyms: alate |
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| albescent | (adjective) becoming or shading into white | - |
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| albinistic | (adjective) of or pertaining to or affected by albinism | Synonyms: albinal, albinic, albinotic |
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| albinotic | (adjective) of or pertaining to or affected by albinism | Synonyms: albinal, albinic, albinistic |
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| albitic | (adjective) of or related to albite feldspar | - |
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| alcalescent | (adjective) tending to become alkaline; slightly alkaline | Synonyms: alkalescent |
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| alchemistic | (adjective) of or relating to alchemists | Synonyms: alchemistical |
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| alchemistical | (adjective) of or relating to alchemists | Synonyms: alchemistic |
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| aleatory | (adjective) dependent on chance | - |
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| alert | (adjective) engaged in or accustomed to close observation | Synonyms: watchful |
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| (adjective) mentally perceptive and responsive | Synonyms: alive, awake |
| (adjective) quick and energetic | Synonyms: brisk, lively, merry, rattling, snappy, spanking, zippy |
| algometric | (adjective) of or related to algometry | Synonyms: algometrical |
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| algometrical | (adjective) of or related to algometry | Synonyms: algometric |
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| algorithmic | (adjective) of or relating to or having the characteristics of an algorithm | - |
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| alienated | (adjective) caused to be unloved | Synonyms: estranged |
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| (adjective) socially disoriented | Synonyms: anomic, disoriented |
| alienating | (adjective) causing hostility or loss of friendliness | - |
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| alight | (adjective) lighted up by or as by fire or flame | Synonyms: ablaze, afire, aflame, aflare, on fire |
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| alimental | (adjective) of or providing nourishment | Synonyms: alimentary, nourishing, nutrient, nutritious, nutritive |
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| alimentary | (adjective) of or providing nourishment | Synonyms: alimental, nourishing, nutrient, nutritious, nutritive |
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| alimentative | (adjective) related to the supply of aliment | - |
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