Source : Webster's Revised Unabridged Dictionary (1913)

Acrimonious \Ac"ri*mo"ni*ous\, a. [Cf. LL. acrimonious, F.
   acrimonieux.]
   1. Acrid; corrosive; as, acrimonious gall. [Archaic]
      --Harvey.

   2. Caustic; bitter-tempered' sarcastic; as, acrimonious
      dispute, language, temper.

Source : WordNet®

acrimonious
     adj : marked by strong resentment or cynicism; "an acrimonious
           dispute"; "bitter about the divorce" [syn: {bitter}]