| araneidan | (adjective) relating to or resembling a spider | Synonyms: araneidal |
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| arbitrational | (adjective) relating to or resulting from arbitration | Synonyms: arbitral |
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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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| arcadian | (adjective) (used with regard to idealized country life) idyllically rustic | Synonyms: bucolic, pastoral |
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| arcane | (adjective) requiring secret or mysterious knowledge | - |
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| archaean | (adjective) of or relating to the earliest known rocks formed during the Precambrian Eon | Synonyms: archean |
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| archangelic | (adjective) of or relating to or resembling archangels | Synonyms: archangelical |
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| archangelical | (adjective) of or relating to or resembling archangels | Synonyms: archangelic |
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| archdiocesan | (adjective) of or relating to an archdiocese | - |
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| archean | (adjective) of or relating to the earliest known rocks formed during the Precambrian Eon | Synonyms: archaean |
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| archegonial | (adjective) of or relating to an archegonium | Synonyms: archegoniate |
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| archegoniate | (adjective) of or relating to an archegonium | Synonyms: archegonial |
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| archidiaconal | (adjective) of or relating to an archdeacon or his office | - |
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| arching | (adjective) forming or resembling an arch | Synonyms: arced, arched, arciform, arcuate, bowed |
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| architectonic | (adjective) of or pertaining to construction or architecture | Synonyms: tectonic |
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| archosaurian | (adjective) of or relating to reptiles of the subclass Archosauria | - |
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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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| 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 | - |
| arrant | (adjective) without qualification; used informally as (often pejorative) intensifiers | Synonyms: complete, consummate, double-dyed, everlasting, gross, perfect, pure, sodding, staring, stark, thorough, thoroughgoing, unadulterated, utter |
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| arresting | (adjective) commanding attention | Synonyms: sensational, stunning |
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| arrogant | (adjective) having or showing feelings of unwarranted importance out of overbearing pride | Synonyms: chesty, self-important |
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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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| artesian | (adjective) (of water) rising to the surface under internal hydrostatic pressure | - |
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| arthropodan | (adjective) of or relating to invertebrates of the phylum Arthropoda | Synonyms: arthropodal, arthropodous |
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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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| ascensional | (adjective) tending to rise | - |
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| ascensive | (adjective) tending or directed upward | Synonyms: ascendant, ascendent |
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| ascertainable | (adjective) capable of being ascertained or found out | Synonyms: discoverable |
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| ascertained | (adjective) discovered or determined by scientific observation | Synonyms: discovered, observed |
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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 | - |
| asinine | (adjective) extremely silly or stupid | Synonyms: fatuous, inane |
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| askance | (adjective) (used especially of glances) directed to one side with or as if with doubt or suspicion or envy | Synonyms: askant, asquint, sidelong, squint-eyed, squint, squinty |
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| askant | (adjective) (used especially of glances) directed to one side with or as if with doubt or suspicion or envy | Synonyms: askance, asquint, sidelong, squint-eyed, squint, squinty |
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| aslant | (adjective) having an oblique or slanted direction | Synonyms: aslope, diagonal, slanted, slanting, sloped, sloping |
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| asphyxiating | (adjective) tending to deprive of oxygen | - |
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| aspirant | (adjective) desiring or striving for recognition or advancement | Synonyms: aspiring, wishful |
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| aspiring | (adjective) desiring or striving for recognition or advancement | Synonyms: aspirant, wishful |
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| asquint | (adjective) (used especially of glances) directed to one side with or as if with doubt or suspicion or envy | Synonyms: askance, askant, sidelong, squint-eyed, squint, squinty |
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| assassinated | (adjective) murdered by surprise attack for political reasons | - |
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| assentient | (adjective) expressing agreement or consent | Synonyms: assenting |
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| assenting | (adjective) expressing agreement or consent | Synonyms: assentient |
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| asserting | (adjective) relating to the use of or having the nature of a declaration | Synonyms: declarative, declaratory |
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| assignable | (adjective) legally transferable to the ownership of another | Synonyms: conveyable, negotiable, transferable, transferrable |
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| assigned | (adjective) appointed to a post or duty | - |
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| assimilating | (adjective) capable of taking (gas, light, or liquids) into a solution | Synonyms: assimilative, assimilatory |
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| assistant | (adjective) of or relating to a person who is subordinate to another | Synonyms: adjunct |
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| associational | (adjective) of or relating to associations or associationism | - |
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| assonant | (adjective) having the same vowel sound occurring with different consonants in successive words or stressed syllables | - |
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| (adjective) having the same sound (especially the same vowel sound) occurring in successive stressed syllables | - |
| assuming | (adjective) excessively forward | Synonyms: assumptive, presumptuous |
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| assurgent | (adjective) growing or extending upward | - |
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| (adjective) rising from the sea | - |
| assuring | (adjective) giving confidence | - |
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| asternal | (adjective) not connected to the sternum or breastbone | - |
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| asthenic | (adjective) having a slender physique | - |
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| (adjective) lacking energy or vitality | Synonyms: adynamic, debilitated, enervated |
| 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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| astonishing | (adjective) so surprisingly impressive as to stun or overwhelm | Synonyms: astounding, staggering, stupefying |
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| (adjective) surprising greatly | Synonyms: amazing |
| 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 |
| astringent | (adjective) tending to draw together or constrict soft organic tissue | - |
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| (adjective) sour or bitter in taste | Synonyms: acerb, acerbic |
| astronautic | (adjective) of or belonging to astronauts or the science of astronautics | Synonyms: astronautical |
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| astronautical | (adjective) of or belonging to astronauts or the science of astronautics | Synonyms: astronautic |
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| astronomic | (adjective) relating or belonging to the science of astronomy | Synonyms: astronomical |
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| (adjective) inconceivably large | Synonyms: astronomical, galactic |
| astronomical | (adjective) relating or belonging to the science of astronomy | Synonyms: astronomic |
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| (adjective) inconceivably large | Synonyms: astronomic, galactic |
| asunder | (adjective) widely separated especially in space | - |
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| asynchronous | (adjective) not synchronous; not occurring or existing at the same time or having the same period or phase | - |
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| (adjective) (digital communication) pertaining to a transmission technique that does not require a common clock between the communicating devices; timing signals are derived from special characters in the data stream itself | - |
| asyndetic | (adjective) lacking conjunctions | - |
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| asynergic | (adjective) of or relating to the state of asynergy; lacking synergy | - |
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| atonal | (adjective) characterized by avoidance of traditional western tonality | Synonyms: unkeyed |
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| atonalistic | (adjective) of or relating to atonalism | - |
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| atonic | (adjective) (used of syllables) carrying no stress | Synonyms: unaccented |
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| (adjective) characterized by a lack of tonus | - |
| atrioventricular | (adjective) relating to or affecting the atria and ventricles of the heart | Synonyms: auriculoventricular |
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| attacking | (adjective) disposed to attack | Synonyms: assaultive |
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| attainable | (adjective) capable of being attained or accomplished | Synonyms: come-at-able |
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| attained | (adjective) achieved or reached | - |
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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 | - |
| attitudinal | (adjective) of or relating to attitudes | - |
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| attritional | (adjective) relating to or caused by attrition | - |
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| auburn | (adjective) (of hair) colored a moderate reddish-brown | - |
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| 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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