| apprehensible | (adjective) capable of being apprehended or understood | Synonyms: graspable, intelligible, perceivable, understandable |
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| apprehensive | (adjective) in fear or dread of possible evil or harm | - |
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| (adjective) quick to understand | Synonyms: discerning |
| (adjective) mentally upset over possible misfortune or danger etc | Synonyms: worried |
| apprenticed | (adjective) bound by contract | Synonyms: articled, bound, indentured |
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| appurtenant | (adjective) furnishing added support | Synonyms: accessory, adjunct, adjuvant, ancillary, auxiliary |
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| arborescent | (adjective) resembling a tree in form and branching structure | Synonyms: arboreal, arboreous, arboresque, arboriform, dendriform, dendroid, dendroidal, tree-shaped, treelike |
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| ardent | (adjective) glowing or shining like fire | - |
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| (adjective) characterized by strong enthusiasm | Synonyms: warm |
| (adjective) characterized by intense emotion | Synonyms: fervent, fervid, fiery, impassioned, perfervid, torrid |
| arenaceous | (adjective) resembling or containing or abounding in sand; or growing in sandy areas | Synonyms: sandlike, sandy |
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| arenicolous | (adjective) growing or living or burrowing in sand | - |
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| argent | (adjective) of lustrous grey; covered with or tinged with the color of silver | Synonyms: silver, silverish, silvery |
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| argentic | (adjective) relating to compounds in which silver is bivalent | - |
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| argentiferous | (adjective) containing or yielding silver | - |
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| argentous | (adjective) relating to compounds in which silver is univalent | - |
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| argumentative | (adjective) given to or characterized by argument | - |
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| arsenical | (adjective) relating to or containing arsenic | - |
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| arsenious | (adjective) relating to compounds in which arsenic is trivalent | - |
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| arteriovenous | (adjective) connecting an artery to a vein | - |
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| ascendable | (adjective) capable of being ascended | Synonyms: ascendible, climbable |
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| ascendant | (adjective) tending or directed upward | Synonyms: ascendent, ascensive |
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| (adjective) most powerful or important or influential | Synonyms: ascendent, dominating |
| ascendent | (adjective) tending or directed upward | Synonyms: ascendant, ascensive |
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| (adjective) most powerful or important or influential | Synonyms: ascendant, dominating |
| ascendible | (adjective) capable of being ascended | Synonyms: ascendable, climbable |
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| ascending | (adjective) moving or going or growing upward | - |
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| ascensional | (adjective) tending to rise | - |
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| ascensive | (adjective) tending or directed upward | Synonyms: ascendant, ascendent |
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| ashen | (adjective) anemic looking from illness or emotion | Synonyms: blanched, bloodless, livid, white |
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| (adjective) made of wood of the ash tree | - |
| assentient | (adjective) expressing agreement or consent | Synonyms: assenting |
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| assenting | (adjective) expressing agreement or consent | Synonyms: assentient |
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| assurgent | (adjective) growing or extending upward | - |
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| (adjective) rising from the sea | - |
| asthenic | (adjective) having a slender physique | - |
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| (adjective) lacking energy or vitality | Synonyms: adynamic, debilitated, enervated |
| astringent | (adjective) tending to draw together or constrict soft organic tissue | - |
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| (adjective) sour or bitter in taste | Synonyms: acerb, acerbic |
| atrioventricular | (adjective) relating to or affecting the atria and ventricles of the heart | Synonyms: auriculoventricular |
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| attendant | (adjective) being present (at a meeting or event, etc.) | - |
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| (adjective) occurring with or following as a consequence | Synonyms: accompanying, collateral, concomitant, consequent, ensuant, incidental, resultant, sequent |
| attended | (adjective) playing or singing with instrumental or vocal accompaniment | Synonyms: accompanied |
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| (adjective) having a caretaker or other watcher | Synonyms: tended to |
| attending | (adjective) giving practical help to | Synonyms: ministrant |
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| attentional | (adjective) of or relating to attention | - |
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| attentive | (adjective) (often followed by `to') giving care or attention | - |
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| (adjective) taking heed; giving close and thoughtful attention | Synonyms: heedful, paying attention, thoughtful |
| attenuate | (adjective) reduced in strength | Synonyms: attenuated, faded, weakened |
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| attenuated | (adjective) reduced in strength | Synonyms: attenuate, faded, weakened |
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| (adjective) of an electrical signal; reduced in amplitude with little or no distortion | - |
| augmentative | (adjective) increasing or having the power to increase especially in size or amount or degree | - |
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| (adjective) intensifying by augmentation and enhancement | Synonyms: enhancive |
| augmented | (adjective) added to or made greater in amount or number or strength | - |
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| auriculoventricular | (adjective) relating to or affecting the atria and ventricles of the heart | Synonyms: atrioventricular |
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| austenitic | (adjective) composed of austenite | - |
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| authentic | (adjective) not counterfeit or copied | Synonyms: bona fide, unquestionable, veritable |
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| (adjective) conforming to fact and therefore worthy of belief | Synonyms: reliable |
| authenticated | (adjective) established as genuine | Synonyms: attested, documented |
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| autofluorescent | (adjective) emitting light via self-induced fluorescence | - |
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| autogenetic | (adjective) of or relating to autogenesis | - |
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| autogenic | (adjective) originating within the body | Synonyms: autogenous |
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| autogenous | (adjective) originating within the body | Synonyms: autogenic |
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| avenged | (adjective) for which vengeance has been taken | - |
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| avirulent | (adjective) not virulent; unable to produce disease | - |
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| awakened | (adjective) aroused or activated | - |
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| (adjective) (somewhat formal) having been waked up | - |
| awestricken | (adjective) having or showing a feeling of mixed reverence and respect and wonder and dread | Synonyms: awed, awestruck |
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| axenic | (adjective) (of experimental animals) raised under sterile conditions | - |
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| (adjective) (used of cultures of microorganisms) completely free from other organisms | - |
| barren | (adjective) providing no shelter or sustenance | Synonyms: bare, bleak, desolate, stark |
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| (adjective) completely wanting or lacking | Synonyms: destitute, devoid, free, innocent |
| (adjective) not bearing offspring | - |
| battlemented | (adjective) having or resembling repeated square indentations like those in a battlement | Synonyms: castellated, castled, crenelated, embattled |
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| (adjective) protected with battlements or parapets with indentations or embrasures for shooting through | - |
| beaten | (adjective) formed or made thin by hammering | - |
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| (adjective) much trodden and worn smooth or bare | - |
| bedridden | (adjective) confined to bed (by illness) | Synonyms: bedfast, bedrid, sick-abed |
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| beechen | (adjective) consisting of or made of wood of the beech tree | - |
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| begotten | (adjective) (of offspring) generated by procreation | - |
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| beholden | (adjective) under a moral obligation to someone | - |
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| belligerent | (adjective) characteristic of an enemy or one eager to fight | Synonyms: aggressive |
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| (adjective) engaged in war | Synonyms: militant, war-ridden, warring |
| bendable | (adjective) capable of being bent or flexed or twisted without breaking | Synonyms: pliable, pliant, waxy |
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| bended | (adjective) used of the back and knees; stooped | Synonyms: bent |
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| benedictive | (adjective) expressing benediction | Synonyms: benedictory |
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| benedictory | (adjective) expressing benediction | Synonyms: benedictive |
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| benefic | (adjective) exerting a favorable or beneficent influence | - |
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| beneficed | (adjective) having a benefice | - |
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| beneficent | (adjective) doing or producing good | - |
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| (adjective) generous in assistance to the poor | Synonyms: benevolent, eleemosynary, philanthropic |
| beneficial | (adjective) promoting or enhancing well-being | Synonyms: good |
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| beneficiary | (adjective) having or arising from a benefice | - |
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| benevolent | (adjective) intending or showing kindness | - |
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| (adjective) generous in assistance to the poor | Synonyms: beneficent, eleemosynary, philanthropic |
| (adjective) generous in providing aid to others | Synonyms: freehearted |
| (adjective) showing or motivated by sympathy and understanding and generosity | Synonyms: charitable, good-hearted, kindly, large-hearted, openhearted, sympathetic |
| benighted | (adjective) lacking enlightenment or knowledge or culture | Synonyms: dark |
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| (adjective) overtaken by night or darkness | Synonyms: nighted |
| benign | (adjective) pleasant and beneficial in nature or influence | Synonyms: benignant |
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| (adjective) not dangerous to health; not recurrent or progressive (especially of a tumor) | - |
| (adjective) kindness of disposition or manner | - |
| benignant | (adjective) pleasant and beneficial in nature or influence | Synonyms: benign |
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| (adjective) characterized by kindness and warm courtesy especially of a king to his subjects | Synonyms: gracious |
| bent | (adjective) of metal e.g. | Synonyms: crumpled, dented |
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| (adjective) fixed in your purpose | Synonyms: bent on, dead set, out to |
| (adjective) used of the back and knees; stooped | Synonyms: bended |
| benthal | (adjective) of or relating to or happening on the bottom under a body of water | Synonyms: benthic, benthonic |
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| benthic | (adjective) of or relating to or happening on the bottom under a body of water | Synonyms: benthal, benthonic |
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| benthonic | (adjective) of or relating to or happening on the bottom under a body of water | Synonyms: benthal, benthic |
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| bentonitic | (adjective) of or relating to or containing bentonite | - |
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| benumbed | (adjective) lacking sensation | Synonyms: asleep, numb |
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| (adjective) having lost or been caused to lose interest because of overexposure | Synonyms: dulled |
| benzenoid | (adjective) similar to benzene in structure or linkage | - |
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| benzoic | (adjective) containing or derived from benzoic acid or benzoin | - |
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| benzylic | (adjective) relating to benzyl | - |
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| bespoken | (adjective) pledged to be married | Synonyms: betrothed, engaged |
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| (adjective) (of clothing) custom-made | Synonyms: bespoke, made-to-order, tailor-made, tailored |
| besprent | (adjective) sprinkled over | - |
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| bicentenary | (adjective) of or relating to or completing a period of 200 years | Synonyms: bicentennial |
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| bicentennial | (adjective) of or relating to or completing a period of 200 years | Synonyms: bicentenary |
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| bicentric | (adjective) having two centers | - |
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| bidentate | (adjective) having toothlike projections that are themselves toothed | - |
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| biennial | (adjective) having a life cycle lasting two seasons | Synonyms: two-year |
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| (adjective) occurring every second year | Synonyms: biyearly |
| bigeneric | (adjective) resulting from a cross between species of different genera | - |
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| bimillenial | (adjective) of or relating to a bimillennium | - |
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| biogenetic | (adjective) of or relating to the production of living organisms from other living organisms | - |
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| biogenic | (adjective) produced by living organisms or biological processes | - |
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| (adjective) essential for maintaining the fundamental life processes | - |
| biogenous | (adjective) producing or produced by living things | - |
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| bioluminescent | (adjective) (of living organisms) emitting light | - |
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| birchen | (adjective) consisting of or made of wood of the birch tree | Synonyms: birch, birken |
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| birefringent | (adjective) relating to or characterized by double refraction | - |
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| birken | (adjective) consisting of or made of wood of the birch tree | Synonyms: birch, birchen |
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| bitumenoid | (adjective) like bitumen | Synonyms: bituminoid |
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| bivalent | (adjective) used of homologous chromosomes associated in pairs in synapsis | Synonyms: double |
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| (adjective) having a valence of two or having two valences | Synonyms: divalent |