| araceous | (adjective) relating to a plant of the family Araceae | Synonyms: aroid |
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| arboraceous | (adjective) abounding in trees | Synonyms: arboreous, woodsy, woody |
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| arboreous | (adjective) inhabiting or frequenting trees | Synonyms: arboreal, tree-living |
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| (adjective) resembling a tree in form and branching structure | Synonyms: arboreal, arborescent, arboresque, arboriform, dendriform, dendroid, dendroidal, tree-shaped, treelike |
| (adjective) abounding in trees | Synonyms: arboraceous, woodsy, woody |
| arborous | (adjective) of or relating to or formed by trees | Synonyms: arborary, arboreal, arborical |
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| 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 |
| 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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| argentiferous | (adjective) containing or yielding silver | - |
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| argentous | (adjective) relating to compounds in which silver is univalent | - |
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| argillaceous | (adjective) resembling or containing clay | Synonyms: clayey |
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| armless | (adjective) having no arms | - |
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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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| arthropodous | (adjective) of or relating to invertebrates of the phylum Arthropoda | Synonyms: arthropodal, arthropodan |
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| arthrosporous | (adjective) of or relating to arthrospores | Synonyms: arthrosporic |
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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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| artless | (adjective) simple and natural; without cunning or deceit | - |
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| (adjective) characterized by an inability to mask your feelings; not devious | Synonyms: ingenuous |
| (adjective) (of persons) lacking art or knowledge | Synonyms: uncultivated, uncultured |
| (adjective) showing lack of art | - |
| arundinaceous | (adjective) of or relating to or resembling reedlike plants of the genus Arundinaria | - |
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| asclepiadaceous | (adjective) of or relating to plants of the milkweed family | - |
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| ascocarpous | (adjective) of or relating to ascocarps | - |
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| ascomycetous | (adjective) related to or characteristic of fungi of the class Ascomycetes | - |
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| ascosporous | (adjective) of or relating to ascospores | Synonyms: ascosporic |
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| assiduous | (adjective) marked by care and persistent effort | Synonyms: sedulous |
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| astomatous | (adjective) having no mouth or mouthlike opening | Synonyms: mouthless |
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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 | - |
| atheromatous | (adjective) of or relating to or resembling atheroma | Synonyms: atheromatic |
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| atrabilious | (adjective) irritable as if suffering from indigestion | Synonyms: bilious, dyspeptic, liverish |
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| atrocious | (adjective) provoking horror | Synonyms: frightful, horrible, horrifying, ugly |
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| (adjective) exceptionally bad or displeasing | Synonyms: abominable, awful, dreadful, painful, terrible, unspeakable |
| (adjective) shockingly brutal or cruel | Synonyms: flagitious, grievous, monstrous |
| 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 |
| auriferous | (adjective) containing gold | Synonyms: gold-bearing |
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| aurous | (adjective) of or relating to or containing or derived from gold | Synonyms: auric |
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| auspicious | (adjective) auguring favorable circumstances and good luck | - |
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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 |
| autoecious | (adjective) of parasites especially rust fungi; completing the entire life cycle on a single host | Synonyms: homoecious |
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| autogamous | (adjective) characterized by or fit for autogamy | Synonyms: autogamic |
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| autogenous | (adjective) originating within the body | Synonyms: autogenic |
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| autoicous | (adjective) having male and female reproductive organs in separate clusters on the same plant | - |
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| autologous | (adjective) derived from organisms of the selfsame individual | - |
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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 | - |
| avaricious | (adjective) immoderately desirous of acquiring e.g. wealth | Synonyms: covetous, grabby, grasping, greedy, prehensile |
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| aweless | (adjective) neither feeling nor showing respect | Synonyms: awless, disrespectful |
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| (adjective) devoid of any feeling of awe or reverence | Synonyms: awless |
| awless | (adjective) neither feeling nor showing respect | Synonyms: aweless, disrespectful |
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| (adjective) devoid of any feeling of awe or reverence | Synonyms: aweless |
| awnless | (adjective) lacking or having only very short awns | - |
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| azygos | (adjective) occurring singly; not one of a pair | Synonyms: azygous |
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| azygous | (adjective) occurring singly; not one of a pair | Synonyms: azygos |
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| bacciferous | (adjective) producing or bearing berries | Synonyms: baccate, berried |
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| baccivorous | (adjective) feeding on berries | - |
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| backless | (adjective) lacking a back | - |
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| backstairs | (adjective) secret and sly or sordid | Synonyms: backstair, furtive |
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| bacteriophagous | (adjective) of or relating to bacteriophages | Synonyms: bacteriophagic |
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| badass | (adjective) being impressive due to extreme attitude or style | - |
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| barbarous | (adjective) (of persons or their actions) able or disposed to inflict pain or suffering | Synonyms: brutal, cruel, fell, roughshod, savage, vicious |
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| (adjective) primitive in customs and culture | - |
| baseless | (adjective) without a basis in reason or fact | Synonyms: groundless, idle, unfounded, unwarranted, wild |
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| basidiomycetous | (adjective) pertaining to or characteristic of fungi of the class Basidiomycetes | - |
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| basidiosporous | (adjective) of or relating to or characterized by spores produced by basidia | - |
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| bass | (adjective) having or denoting a low vocal or instrumental range | Synonyms: deep |
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| bats | (adjective) informal or slang terms for mentally irregular | Synonyms: around the bend, balmy, barmy, batty, bonkers, buggy, cracked, crackers, daft, dotty, fruity, haywire, kookie, kooky, loco, loony, loopy, nuts, nutty, round the bend, wacky, whacky |
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| beakless | (adjective) not having a beak or bill | - |
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| beardless | (adjective) lacking hair on the face | Synonyms: smooth-faced |
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| (adjective) having no beard | Synonyms: whiskerless |
| beauteous | (adjective) (poetic) beautiful, especially to the sight | - |
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| bedless | (adjective) without a bed | - |
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| bellyless | (adjective) lacking a prominent belly | Synonyms: flat-bellied |
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| beltless | (adjective) lacking a belt | Synonyms: unbelted |
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| betulaceous | (adjective) of or pertaining to or characteristic of trees of the birch family | - |
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| bias | (adjective) slanting diagonally across the grain of a fabric | - |
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| bibless | (adjective) lacking a bib | - |
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| bibliolatrous | (adjective) given to Bible-worship | - |
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| bibulous | (adjective) given to or marked by the consumption of alcohol | Synonyms: boozy, drunken, sottish |
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| bicephalous | (adjective) having two heads | - |
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| bicornuous | (adjective) having two horns or horn-shaped parts | Synonyms: bicorn, bicornate, bicorned, bicornuate |
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| bigamous | (adjective) of illegal marriage to a second person while legally married to a first | - |
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| bignoniaceous | (adjective) of or pertaining to or characteristic of plants of the family Bignoniaceae | - |
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| bilious | (adjective) relating to or containing bile | Synonyms: biliary |
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| (adjective) irritable as if suffering from indigestion | Synonyms: atrabilious, dyspeptic, liverish |
| (adjective) suffering from or suggesting a liver disorder or gastric distress | Synonyms: liverish, livery |
| biogenous | (adjective) producing or produced by living things | - |
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| biparous | (adjective) producing two offspring at a time | Synonyms: twinning |
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| biramous | (adjective) resembling a fork; divided or separated into two branches | Synonyms: bifurcate, branched, forficate, fork-like, forked, pronged, prongy |
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| bituminous | (adjective) resembling or containing bitumen | - |
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| blameless | (adjective) free of guilt; not subject to blame | Synonyms: inculpable, irreproachable, unimpeachable |
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| blasphemous | (adjective) characterized by profanity or cursing | Synonyms: blue, profane |
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| (adjective) grossly irreverent toward what is held to be sacred | Synonyms: profane, sacrilegious |
| bloodless | (adjective) free from blood or bloodshed | - |
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| (adjective) anemic looking from illness or emotion | Synonyms: ashen, blanched, livid, white |
| (adjective) destitute of blood or apparently so | Synonyms: exsanguine, exsanguinous |
| (adjective) devoid of human emotion or feeling | - |
| (adjective) without vigor or zest or energy | - |
| blusterous | (adjective) blowing in violent and abrupt bursts | Synonyms: blustering, blustery |
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| bodacious | (adjective) unrestrained by convention or propriety | Synonyms: audacious, bald-faced, barefaced, brassy, brazen-faced, brazen, insolent |
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| (adjective) incorrigible | - |
| bodiless | (adjective) not having a material body | Synonyms: discorporate, disembodied, unbodied, unembodied |
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| (adjective) having no trunk or main part | Synonyms: bodyless |
| bodyless | (adjective) having no trunk or main part | Synonyms: bodiless |
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| bogus | (adjective) fraudulent; having a misleading appearance | Synonyms: bastard, fake, phoney, phony |
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| boisterous | (adjective) noisy and lacking in restraint or discipline | Synonyms: rambunctious, robustious, rumbustious, unruly |
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| (adjective) full of rough and exuberant animal spirits | Synonyms: knockabout |
| (adjective) violently agitated and turbulent | Synonyms: fierce, rough |
| boneless | (adjective) being without a bone or bones | - |
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| bonkers | (adjective) informal or slang terms for mentally irregular | Synonyms: around the bend, balmy, barmy, bats, batty, buggy, cracked, crackers, daft, dotty, fruity, haywire, kookie, kooky, loco, loony, loopy, nuts, nutty, round the bend, wacky, whacky |
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| bootless | (adjective) unproductive of success | Synonyms: fruitless, futile, sleeveless, vain |
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| boss | (adjective) exceptionally good | Synonyms: brag |
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| bottomless | (adjective) having no bottom | - |
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| (adjective) extremely deep | - |
| (adjective) unclothed especially below the waist or featuring such nudeness | - |
| (adjective) having no apparent limits or bounds | - |
| boughless | (adjective) having no boughs (of trees) | - |
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| boundless | (adjective) seemingly boundless in amount, number, degree, or especially extent | Synonyms: limitless, unbounded |
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| bounteous | (adjective) given or giving freely | Synonyms: big, bighearted, bountiful, freehanded, giving, handsome, liberal, openhanded |
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| bourgeois | (adjective) (according to Marxist thought) being of the property-owning class and exploitive of the working class | - |
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| (adjective) belonging to the middle class | - |
| (adjective) conforming to the standards and conventions of the middle class | Synonyms: conservative, materialistic |
| bowelless | (adjective) ruthless in competition | Synonyms: cutthroat, fierce |
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| brachiopodous | (adjective) of or belonging to the phylum Brachiopoda | Synonyms: brachiopod |
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| brachydactylous | (adjective) having abnormally short finger or toes | Synonyms: brachydactylic |
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| brachypterous | (adjective) (especially of certain insects) having very short or rudimentary wings | Synonyms: short-winged |
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| brachyurous | (adjective) of or belonging to the suborder Brachyura | - |
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