- bacchanal: (n) a drunken reveler; party-goer
- badinage: (n) witty conversation
- baleful: (adj) threatening; sinister; deadly
- banal: (adj) ordinary; commonplace; trite
- bane: (n) deadly poison; cause of harm; torment
- bastion: (n) fortress; stronghold
- battery: (n) the unlawful beating of another
- bauble: (n) small, showy, worthless trinket or decoration
- beget: (v) to sire, to procreate as the father; to produce as an effect, to cause
- beguile: (v) to charm, enchant; to deceive; to while away time
- belabor: (v) to repeat a point unnecessarily, even absurdly
- beleaguer: (v) to surround, besiege; to relentless harass
- belie: (v) to contradict; to make a false impression
- belittle: (v) to put someone down; to insult
- bellicose: (adj) quarrelsome; warlike
- belligerent: (adj) warlike; stubbornly inclined to fight
- bemused: (adj) confused; dazed; bewildered
- benediction: (n) blessing, consecreation
- benign: (adj) homeless; gentle; safe
- bequest: (n) something left to someone in a will; legacy
- bereft: (v) to left alone and esolate (esp. by the death of a loved one)
- beset: (v) to harass; to trouble; to overwhelm
- betimes: (adv) in good time; early (literary)
- bevy: (n) a group, flock
- bicameral: (adj) composed of two chambers of legislative branches
- biennial: (adj) occuring every two years
- bilious: (adj) foul-tempered; bitter; irritable
- bilk: (v) to cheat, swindle; to avoid payment
- biopsy: (n) the removal of a piece of tissue from a living body for examination
- bombast: (n) pompous language; pretentious, meaningless speech
- bourgeois: (adj) middle class; conventional; of narrow, materialistic interests
- bovine: (adj) like a cow in nature and shape; sluggish, stupid
- braggadocio: (n) empty boasting; vanity; swaggering
- bravado: (n) boldness intended to impress or intimidate
- bravura: (n) a display of daring; a brilliant performance
- brevity: (n) briefness
- broach: (v) to bring up a subject, particularly a difficult one
- bucolic: (adj) rustic, charmingly rural
- bumptious: (adj) irritatingly self-assertive; offensively conceited
- burgeon: (v) to expand, flourish, blossom