| auriculoventricular | (adjective) relating to or affecting the atria and ventricles of the heart | Synonyms: atrioventricular |
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| aurorean | (adjective) characteristic of the dawn | Synonyms: auroral |
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| austenitic | (adjective) composed of austenite | - |
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| australopithecine | (adjective) of or belonging to the hominid genus Australopithecus | - |
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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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| authoritarian | (adjective) expecting unquestioning obedience | Synonyms: dictatorial, overbearing |
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| (adjective) characteristic of an absolute ruler or absolute rule; having absolute sovereignty | Synonyms: autocratic, despotic, dictatorial, tyrannic, tyrannical |
| autochthonal | (adjective) originating where it is found | Synonyms: autochthonic, autochthonous, endemic, indigenous |
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| autochthonic | (adjective) originating where it is found | Synonyms: autochthonal, autochthonous, endemic, indigenous |
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| autochthonous | (adjective) of rocks, deposits, etc.; found where they and their constituents were formed | - |
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| (adjective) originating where it is found | Synonyms: autochthonal, autochthonic, endemic, indigenous |
| 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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| autoimmune | (adjective) of or relating to the immune response of the body against substance normally present in the body | - |
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| autoloading | (adjective) (of firearms) capable of automatic loading and firing continuously | Synonyms: self-loading, semiautomatic |
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| automatonlike | (adjective) resembling the unthinking functioning of a machine | Synonyms: automatic, machinelike, robotic, robotlike |
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| autonomic | (adjective) relating to or controlled by the autonomic nervous system | - |
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| autonomous | (adjective) (of political bodies) not controlled by outside forces | Synonyms: independent, self-governing, sovereign |
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| (adjective) (of persons) free from external control and constraint in e.g. action and judgment | Synonyms: self-directed, self-reliant |
| (adjective) existing as an independent entity | - |
| autosemantic | (adjective) of a word or phrase meaningful in isolation, independent of context | - |
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| autumnal | (adjective) of or characteristic of or occurring in autumn | - |
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| (adjective) characteristic of late maturity verging on decline | - |
| auxinic | (adjective) relating to or containing auxins | - |
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| avellan | (adjective) pertaining to filberts or hazelnuts | Synonyms: avellane |
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| avellane | (adjective) pertaining to filberts or hazelnuts | Synonyms: avellan |
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| avenged | (adjective) for which vengeance has been taken | - |
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| avian | (adjective) pertaining to or characteristic of birds | - |
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| avifaunal | (adjective) of or relating to birds of a particular region or period | Synonyms: avifaunistic |
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| avifaunistic | (adjective) of or relating to birds of a particular region or period | Synonyms: avifaunal |
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| avionic | (adjective) of or relating to avionics | - |
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| avirulent | (adjective) not virulent; unable to produce disease | - |
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| avitaminotic | (adjective) of or relating to or characteristic of avitaminosis | - |
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| avocational | (adjective) of or involved in an avocation | - |
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| avuncular | (adjective) being or relating to an uncle | - |
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| (adjective) resembling an uncle in kindness or indulgence | - |
| 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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| awing | (adjective) inspiring awe or admiration or wonder | Synonyms: amazing, awe-inspiring, awesome, awful |
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| awned | (adjective) having awns i.e. bristlelike or hairlike appendages on the flowering parts of some cereals and grasses | Synonyms: awny |
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| awninged | (adjective) covered with an awning | - |
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| awnless | (adjective) lacking or having only very short awns | - |
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| awny | (adjective) having awns i.e. bristlelike or hairlike appendages on the flowering parts of some cereals and grasses | Synonyms: awned |
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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 | - |
| axonal | (adjective) of or relating to or resembling an axon | - |
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| azonal | (adjective) not divided into zones | - |
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| azonic | (adjective) not restricted to any particular zone or region | - |
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| baboonish | (adjective) resembling a baboon | - |
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| bacchanal | (adjective) used of riotously drunken merrymaking | Synonyms: bacchanalian, bacchic, carousing, orgiastic |
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| bacchanalian | (adjective) used of riotously drunken merrymaking | Synonyms: bacchanal, bacchic, carousing, orgiastic |
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| bacchantic | (adjective) of or relating to or resembling a bacchanalian reveler | - |
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| backbreaking | (adjective) characterized by effort to the point of exhaustion; especially physical effort | Synonyms: arduous, grueling, gruelling, hard, heavy, laborious, operose, punishing, toilsome |
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| backhand | (adjective) (of racket strokes) made across the body with back of hand facing direction of stroke | Synonyms: backhanded |
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| (adjective) (of handwriting) having the letters slanting backward | Synonyms: left-slanting |
| backhanded | (adjective) (of racket strokes) made across the body with back of hand facing direction of stroke | Synonyms: backhand |
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| (adjective) roundabout or ambiguous | - |
| baffling | (adjective) making great mental demands; hard to comprehend or solve or believe | Synonyms: elusive, knotty, problematic, problematical, tough |
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| baking | (adjective) as hot as if in an oven | Synonyms: baking hot |
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| balanced | (adjective) being in a state of proper equilibrium | - |
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| balconied | (adjective) having balconies or a balcony | - |
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| balding | (adjective) getting bald | - |
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| balking | (adjective) refusing to proceed, act or work | Synonyms: balky |
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| banal | (adjective) repeated too often; overfamiliar through overuse | Synonyms: commonplace, hackneyed, old-hat, shopworn, stock, threadbare, timeworn, tired, trite, well-worn |
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| banausic | (adjective) (formal) ordinary and not refined | - |
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| bandaged | (adjective) covered or wrapped with a bandage | Synonyms: bound |
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| banded | (adjective) identified with a band especially around a leg | - |
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| (adjective) characterized by a band of especially white around the body | - |
| (adjective) marked with bands or strips of contrasting color or texture | - |
| bandy | (adjective) have legs that curve outward at the knees | Synonyms: bandy-legged, bowed, bowleg, bowlegged |
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| baneful | (adjective) deadly or sinister | Synonyms: baleful |
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| (adjective) exceedingly harmful | Synonyms: deadly, pernicious, pestilent |
| banging | (adjective) (used informally) very large | Synonyms: humongous, thumping, walloping, whopping |
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| bankable | (adjective) acceptable to or at a bank | - |
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| (adjective) guaranteed to bring a profit | - |
| bankrupt | (adjective) financially ruined | Synonyms: belly-up |
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| banned | (adjective) forbidden by law | Synonyms: prohibited |
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| banner | (adjective) unusually good; outstanding | - |
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| bantam | (adjective) very small | Synonyms: diminutive, flyspeck, lilliputian, midget, petite, tiny |
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| bantering | (adjective) cleverly amusing in tone | Synonyms: facetious, tongue-in-cheek |
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| barbarian | (adjective) without civilizing influences | Synonyms: barbaric, savage, uncivilised, uncivilized, wild |
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| barehanded | (adjective) with bare hands | - |
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| baritone | (adjective) lower in range than tenor and higher than bass | - |
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| baronial | (adjective) impressive in size, manner, or appearance | Synonyms: imposing, noble, stately |
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| 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 | - |
| baseborn | (adjective) illegitimate | Synonyms: base |
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| (adjective) of low birth or station (`base' is archaic in this sense) | Synonyms: base, humble, lowly |
| basilican | (adjective) of or relating to or resembling a basilica | - |
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| basinal | (adjective) of or relating to a basin | - |
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| basined | (adjective) enclosed in a basin | - |
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| bastioned | (adjective) secured with bastions or fortifications | Synonyms: fortified |
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| batrachian | (adjective) relating to frogs and toads | Synonyms: anuran, salientian |
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| 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 | - |
| batwing | (adjective) formed or shaped like a bat's wing | - |
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| beaming | (adjective) radiating or as if radiating light | Synonyms: beamy, effulgent, radiant, refulgent |
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| (adjective) cheerful and bright | Synonyms: glad |
| (adjective) pleased and proud | - |
| beardown | (adjective) with full strength | - |
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| bearing | (adjective) (of a structural member) withstanding a weight or strain | - |
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| beaten | (adjective) formed or made thin by hammering | - |
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| (adjective) much trodden and worn smooth or bare | - |
| becoming | (adjective) displaying or setting off to best advantage | - |
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| (adjective) according with custom or propriety | Synonyms: comely, comme il faut, decorous, seemly |
| 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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| beetling | (adjective) jutting or overhanging | Synonyms: beetle |
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| befitting | (adjective) appropriate to | - |
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| beforehand | (adjective) being ahead of time or need | Synonyms: advance |
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| beginning | (adjective) serving to begin | Synonyms: first |
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| begotten | (adjective) (of offspring) generated by procreation | - |
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| beguiling | (adjective) misleading by means of pleasant or alluring methods | - |
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| (adjective) highly attractive and able to arouse hope or desire | Synonyms: alluring, enticing, tempting |
| behind | (adjective) having the lower score or lagging position in a contest | - |
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| behindhand | (adjective) behind schedule | - |
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| beholden | (adjective) under a moral obligation to someone | - |
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| belemnitic | (adjective) of or relating to belemnites | - |
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