Bitter. Harsh, caustic, cutting, savage, acidulous, acrimonious, irate, sharp, sour, stinging, pungent, virulent.
Ant. Sweet, honeyed, nectared, luscious, dulcet, saccharine.
Blacken. Slander, malign, defame, daub, bespatter, befoul, asperse, traduce, vilify, decry, calumniate.
Ant. Clear, eulogize, vindicate, whiten, whitewash.
Blackguard. Rascal, scoundrel, villain.
Ant. Gentleman.
Blame. Censure, rebuke, chide, reprove, reproach, condemn, vituperate, reprobate, reprehend, dispraise.
Ant. Approve, praise, exonerate, acquit, exculpate.
Blameless. Pure, innocent, irresponsible, without fault.
Ant. Guilty, implicated, blameworthy, faulty.