| antiquated | (adjective) so extremely old as seeming to belong to an earlier period | Synonyms: antediluvian, archaic |
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| antithyroid | (adjective) having the effect of counteracting excessive thyroid activity | - |
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| antlered | (adjective) having antlers | - |
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| aperiodic | (adjective) not recurring at regular intervals | Synonyms: nonperiodic |
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| aphrodisiac | (adjective) stimulating sexual desire | Synonyms: aphrodisiacal, sexy |
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| aphrodisiacal | (adjective) stimulating sexual desire | Synonyms: aphrodisiac, sexy |
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| apodal | (adjective) (of snakes and eels) naturally footless | Synonyms: apodous |
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| apodeictic | (adjective) of a proposition; necessarily true or logically certain | Synonyms: apodictic |
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| apodictic | (adjective) of a proposition; necessarily true or logically certain | Synonyms: apodeictic |
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| apodous | (adjective) (of snakes and eels) naturally footless | Synonyms: apodal |
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| apoplectoid | (adjective) resembling apoplexy | Synonyms: apoplectiform |
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| appalled | (adjective) struck with fear, dread, or consternation | Synonyms: aghast, dismayed, shocked |
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| appareled | (adjective) dressed or clothed especially in fine attire; often used in combination | Synonyms: attired, dressed, garbed, garmented, habilimented, robed |
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| appendaged | (adjective) having an appendage | - |
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| appendant | (adjective) affixed as an appendage | - |
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| appendicular | (adjective) relating to or consisting of an appendage or appendages; especially the limbs | - |
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| applaudable | (adjective) worthy of high praise | Synonyms: commendable, laudable, praiseworthy |
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| applied | (adjective) concerned with concrete problems or data rather than with fundamental principles | - |
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| appointed | (adjective) subject to appointment | Synonyms: appointive |
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| (adjective) selected for a job | - |
| (adjective) provided with furnishing and accessories (especially of a tasteful kind) | - |
| (adjective) fixed or established especially by order or command | Synonyms: decreed, ordained, prescribed |
| apportioned | (adjective) given out in portions | Synonyms: dealt out, doled out, meted out, parceled out |
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| appreciated | (adjective) fully understood or grasped | Synonyms: apprehended, comprehended |
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| apprehended | (adjective) fully understood or grasped | Synonyms: appreciated, comprehended |
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| apprenticed | (adjective) bound by contract | Synonyms: articled, bound, indentured |
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| appressed | (adjective) pressed close to or lying flat against something | Synonyms: adpressed |
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| approved | (adjective) established by authority; given authoritative approval | Synonyms: sanctioned |
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| apsidal | (adjective) of or relating to an apse | - |
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| aptitudinal | (adjective) of or relating to aptitudes | - |
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| arachnidian | (adjective) relating to or resembling a member of the class Arachnida | Synonyms: arachnoid, spiderlike, spiderly, spidery |
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| arachnoid | (adjective) relating to or resembling a member of the class Arachnida | Synonyms: arachnidian, spiderlike, spiderly, spidery |
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| araneidal | (adjective) relating to or resembling a spider | Synonyms: araneidan |
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| araneidan | (adjective) relating to or resembling a spider | Synonyms: araneidal |
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| arcadian | (adjective) (used with regard to idealized country life) idyllically rustic | Synonyms: bucolic, pastoral |
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| arced | (adjective) forming or resembling an arch | Synonyms: arched, arching, arciform, arcuate, bowed |
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| archdiocesan | (adjective) of or relating to an archdiocese | - |
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| archducal | (adjective) belonging to or befitting an archduke or his archduchy | - |
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| arched | (adjective) constructed with or in the form of an arch or arches | - |
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| (adjective) forming or resembling an arch | Synonyms: arced, arching, arciform, arcuate, bowed |
| archidiaconal | (adjective) of or relating to an archdeacon or his office | - |
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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 |
| arduous | (adjective) difficult to accomplish; demanding considerable mental effort and skill | - |
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| (adjective) characterized by effort to the point of exhaustion; especially physical effort | Synonyms: backbreaking, grueling, gruelling, hard, heavy, laborious, operose, punishing, toilsome |
| (adjective) taxing to the utmost; testing powers of endurance | Synonyms: straining, strenuous |
| arid | (adjective) lacking sufficient water or rainfall | Synonyms: waterless |
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| (adjective) lacking vitality or spirit; lifeless | Synonyms: desiccate, desiccated |
| ariled | (adjective) (of some seeds) having a fleshy and usually brightly colored cover | Synonyms: arillate |
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| armed | (adjective) (used of persons or the military) characterized by having or bearing arms | - |
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| (adjective) (used of plants and animals) furnished with bristles and thorns | - |
| (adjective) having arms or arms as specified; used especially in combination | - |
| armored | (adjective) protected by armor (used of persons or things military) | Synonyms: armoured |
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| (adjective) used of animals; provided with protective covering | Synonyms: armoured |
| (adjective) equipped with the complete arms and armor of a warrior | Synonyms: panoplied |
| armoured | (adjective) protected by armor (used of persons or things military) | Synonyms: armored |
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| (adjective) used of animals; provided with protective covering | Synonyms: armored |
| aroid | (adjective) relating to a plant of the family Araceae | Synonyms: araceous |
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| aroused | (adjective) (of persons) excessively affected by emotion | Synonyms: emotional, excited, worked up |
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| (adjective) aroused to action | - |
| (adjective) emotionally aroused | Synonyms: stimulated, stirred, stirred up |
| (adjective) keenly excited (especially sexually) or indicating excitement | Synonyms: ablaze, aflame |
| (adjective) feeling great sexual desire | Synonyms: horny, randy, ruttish, steamy, turned on |
| (adjective) brought to a state of great tension | Synonyms: wound up |
| arranged | (adjective) disposed or placed in a particular kind of order | Synonyms: ordered |
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| (adjective) deliberately arranged for effect | Synonyms: staged |
| (adjective) organized or planned for | - |
| arrayed | (adjective) in ceremonial attire and paraphernalia | Synonyms: panoplied |
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| arthropodal | (adjective) of or relating to invertebrates of the phylum Arthropoda | Synonyms: arthropodan, arthropodous |
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| arthropodan | (adjective) of or relating to invertebrates of the phylum Arthropoda | Synonyms: arthropodal, arthropodous |
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| arthropodous | (adjective) of or relating to invertebrates of the phylum Arthropoda | Synonyms: arthropodal, arthropodan |
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| articled | (adjective) bound by contract | Synonyms: apprenticed, bound, indentured |
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| articulated | (adjective) consisting of segments held together by joints | Synonyms: articulate |
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| artiodactyl | (adjective) of or relating to or belonging to mammals of the order Artiodactyla | Synonyms: artiodactylous, even-toed |
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| artiodactylous | (adjective) of or relating to or belonging to mammals of the order Artiodactyla | Synonyms: artiodactyl, even-toed |
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| arundinaceous | (adjective) of or relating to or resembling reedlike plants of the genus Arundinaria | - |
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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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| ascertained | (adjective) discovered or determined by scientific observation | Synonyms: discovered, observed |
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| asclepiadaceous | (adjective) of or relating to plants of the milkweed family | - |
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| ashamed | (adjective) feeling shame or guilt or embarrassment or remorse | - |
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| asphyxiated | (adjective) in a state of asphyxia | - |
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| assassinated | (adjective) murdered by surprise attack for political reasons | - |
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| asserted | (adjective) confidently declared to be so | - |
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| assiduous | (adjective) marked by care and persistent effort | Synonyms: sedulous |
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| assigned | (adjective) appointed to a post or duty | - |
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| assisted | (adjective) having help; often used as a combining form | Synonyms: aided |
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| assorted | (adjective) of many different kinds purposefully arranged but lacking any uniformity | Synonyms: various |
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| (adjective) consisting of a haphazard assortment of different kinds | Synonyms: miscellaneous, mixed, motley, sundry |
| assumed | (adjective) adopted in order to deceive | Synonyms: false, fictitious, fictive, pretended, put on, sham |
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| assured | (adjective) marked by assurance; exhibiting confidence | - |
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| (adjective) characterized by certainty or security | - |
| asteriated | (adjective) (of some crystals especially gemstones) exhibiting asterism | - |
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| asterisked | (adjective) marked with an asterisk | Synonyms: starred |
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| asteroid | (adjective) shaped like a star | Synonyms: star-shaped |
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| asteroidal | (adjective) of or relating to or resembling an asteroid | - |
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| astonied | (adjective) filled with the emotional impact of overwhelming surprise or shock | Synonyms: amazed, astonished, astounded, stunned |
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| astonished | (adjective) filled with the emotional impact of overwhelming surprise or shock | Synonyms: amazed, astonied, astounded, stunned |
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| astounded | (adjective) filled with the emotional impact of overwhelming surprise or shock | Synonyms: amazed, astonied, astonished, stunned |
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| astounding | (adjective) so surprisingly impressive as to stun or overwhelm | Synonyms: astonishing, staggering, stupefying |
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| (adjective) bewildering or striking dumb with wonder | Synonyms: dumbfounding, dumfounding |
| asunder | (adjective) widely separated especially in space | - |
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| asyndetic | (adjective) lacking conjunctions | - |
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| atrophied | (adjective) (of an organ or body part) diminished in size or strength as a result of disease or injury or lack of use | Synonyms: diminished, wasted |
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| attached | (adjective) associated in an exclusive sexual relationship | Synonyms: committed |
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| (adjective) used of buildings joined by common sidewalls | - |
| (adjective) fond and affectionate | - |
| (adjective) being joined in close association | Synonyms: affiliated, connected |
| attained | (adjective) achieved or reached | - |
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| attempted | (adjective) tried unsuccessfully | - |
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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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| 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 | - |
| attested | (adjective) established as genuine | Synonyms: authenticated, documented |
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| attired | (adjective) dressed or clothed especially in fine attire; often used in combination | Synonyms: appareled, dressed, garbed, garmented, habilimented, robed |
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| attitudinal | (adjective) of or relating to attitudes | - |
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| attrited | (adjective) worn by rubbing or friction | - |
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| audacious | (adjective) disposed to venture or take risks | Synonyms: daring, venturesome, venturous |
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| (adjective) invulnerable to fear or intimidation | Synonyms: brave, dauntless, fearless, hardy, intrepid, unfearing |
| (adjective) unrestrained by convention or propriety | Synonyms: bald-faced, barefaced, bodacious, brassy, brazen-faced, brazen, insolent |
| audible | (adjective) heard or perceptible by the ear | Synonyms: hearable |
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| audile | (adjective) of or relating to the process of hearing | Synonyms: auditive, auditory |
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| audiometric | (adjective) of or relating to audiometry | - |
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| audiovisual | (adjective) involving both hearing and seeing (usually relating to teaching aids) | - |
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