| Term | Definition |
| ascetic | self-denying, abstinent, austere |
| ashen | resembling ashes; pale |
| askew | crooked, tilted |
| aspersion | false rumor, damaging report, slander |
| aspire | to have great hopes; to aim at a goal |
| assail | to attack, assault |
| assiduous | diligent, persistent, hard-working |
| assuage | to make less severe, ease, relieve |
| astringent | harsh, severe, stern |
| astute | having good judgment |
| atone | to make amends for a wrong |
| atrocious | monstrous, shockingly bad |
| attain | to accomplish, gain |
| attenuate | to make thin or slender; weaken |
| audacious | bold, daring, fearless |
| audible | capable of being heard |
| augment | to expand, extend |
| august | dignified, awe inspiring, venerable |
| auspicious | having favorable prospects, promising |
| austere | stern, strict, unadorned |
| authoritarian | extremely strict, bossy |
| autocrat | dictator |
| avarice | greed |
| avenge | to retaliate, take revenge for an injury or crime |
| aver | to delare to be true, affirm |
| aversion | intense dislike |
| avery | to turn (something) away; prevent, hinder |
| aviary | large enclosure housing birds |
| awry | crooked, askew, amiss |
| baleful | harmful |
| ballad | folk song, narrative poem |
| balm | soothing, healing influence |
| banal | trite, overly common |
| bane | something causing death, destruction, or ruin |
| banter | playful conversation |
| bastion | fortification, stronghold |
| bay (v.) | to bark, especially in a deep, prolonged way |
| beguile | to decieve, mislead; charm |
| behemoth | huge creature |
| belabor | to insist repeatedly or harp on |
| belie | to misrepresent; expose as false |
| belligerent | hostile, tending to fight |
| benefactor | someone giving aid or money |
| beneficent | kindly, charitable; doing good deeds; producing good effects |
| benighted | unenlightened |
| benign | kindly, gentle, or harmless |
| bequeath | to give or leave through a will; to hand down |
| berate | to scold harshly |
| beseech | to beg, plead, implore |
| bestial | beastly, animal-like |