aboriginal:being the first of its kind in a region: primitive¹: native

　　abortive:unsuccessful: fruitless

　　abstemious:temperate: sparing in drink, etc.

　　abstruse:obscure: profound: difficult to understand

　　acetic:vinegary

　　acidulous:slightly

　　sour: sharp: caustic²

　　acquiescent:accepting passively

　　acrid:sharp: bitterly pungent³

　　acrimonious:stinging: caustic

　　actuarial:calculating; pertaining⁴ to insurance statistics

　　adamant:hard: inflexible⁵

　　addle:rotten: muddled⁶; crazy

　　adept:expert at

　　adipose:fatty

　　adroit:skillful

　　adventitious:accidental: casual

　　adverse:unfavorable: hostile

　　aesthetic:artistic: dealing⁷ with or capable off appreciation⁸ of the beautiful

　　affected:artificial: pretended

　　agape:openmouthed

　　aggregate:sum: total

　　aghast:horrified

　　albeit:although

　　alimentary:supplying nourishment⁹

　　alluvial:pertaining to soil deposits left by rivers, etc.

　　aloof:apart; reserved

　　ambiguous:doubtful in meaning

　　ambulatory:able to walk

　　amenable:readily managed; willing to be led

　　amiable:agreeable; lovable

　　amicable:friendly

　　amorphous:shapeless

　　amphibian:able to live both on land in water

　　ample:abundant

　　amuck:in a state of rage

　　analogous:comparable

　　ancillary:serving as an aid or accessory; auxiliary

　　animated:lively

　　anomalous:abnormal; irregular

　　anonymous:having no name

　　antediluvian:antiquated; ancient

　　anthropoid:manlike

　　apathetic:indifferent

　　apocryphal:not genuine; sham

　　apposite:appropriate; fitting

　　apprehensive:fearful; discerning

　　aquiline:curved; hooked

　　arable:fit for plowing

　　arbitrary:fixed or decided; despotic

　　archaic:antiquated

　　arduous:hard; strenuous

　　aromatic:fragrant

　　arrant:thorough; complete; unmitigated

　　ascetic:practicing self-denial; austere

　　ashen:ash-colored

　　asinine:stupid

　　askance:with a sideway or indirect look

　　askew:crookedly; slanted; at an angle

　　assiduous:diligent

　　astral:relating to the stars

　　astute:wise; shrewd

　　astringent:binding; causing contraction

　　atheistic:denying the existence of God

　　athwart:across; in opposition

　　atypical:not normal

　　auspicious:favoring success

　　austere:strict; stern

　　autonomous:self-governing

　　auxiliary:helper, additional or subsidiary

　　averse:reluctant

　　avid:greedy; eager for

　　avuncular:like an uncle

　　awry:distorted; crooked

　　azure:sky blue

　　bacchanalian:drunken

　　baleful:deadly; destructive

　　balmy:mild; fragrant

　　banal:hackneyed; commonplace; trite

　　baneful:ruinous; poisonous

　　bantering:good-natured ridiculing

　　baroque:highly ornate

　　beatific:giving bliss; blissful

　　belated:delayed

　　bellicose:warlike

　　benevolent:generous; charitable

　　benighted:overcome by darkness

　　benign:kindly; favorable; not malignant

　　bereft:deprived of; lacking

　　berserk:frenzied

　　bicameral:two-chambered, as a legislative body

　　biennial:every two years

　　bilious:suffering from indigestion; irritable

　　bizarre:fantastic; violently contrasting

　　bland:soothing; mild

　　blasphemous:profane; impious

　　blatant:loudly offensive

　　bleak:cold; cheerless

　　blighted:suffering from a disease; destroyed

　　blithe:gay; joyous

　　bloated:swollen or puffed as with water or air

　　bogus:counterfeit; not authentic

　　boisterous:violent; rough; noisy

　　bombastic:pompous; using inflated language

　　bootless:useless

　　bountiful:generous; showing bounty

　　brazen:insolent

　　bristling:rising like bristles; showing irritation

　　brusque:blunt; abrupt

　　bucolic:rustic; pastoral

　　bumptious:self-assertive

　　buxom:plump; vigorous; jolly

　　cadaverous:like a corpse; pale

　　callous:hardened; unfeeling

　　calorific:heat-producing

　　canny:shrewd; thrifty

　　capacious:spacious

　　capricious:fickle; incalculable

　　captious:faultfinding

　　carnal:fleshly

　　carnivorous:meat-eating

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