acrimonious

from WordNet (r) 3.0 (2006)

acrimonious
    adj 1: marked by strong resentment or cynicism; "an acrimonious
           dispute"; "bitter about the divorce" [syn: {acrimonious},
           {bitter}]

from The Collaborative International Dictionary of English v.0.48

Acrimonious \Ac"ri*mo"ni*ous\, a. [Cf. LL. acrimonious, F.
   acrimonieux.]
   1. Acrid; corrosive; as, acrimonious gall. [Archaic]
      --Harvey.
      [1913 Webster]

   2. Caustic; bitter-tempered' sarcastic; as, acrimonious
      dispute, language, temper.
      [1913 Webster]

from Moby Thesaurus II by Grady Ward, 1.0

68 Moby Thesaurus words for "acrimonious":
      acerb, acerbate, acerbic, acid, acidic, acidulent, acidulous,
      acrid, astringent, belligerent, biting, bitter, burning, caustic,
      choleric, contentious, corroding, corrosive, cranky, cross,
      cutting, double-edged, edged, embittered, escharotic, fierce,
      harsh, incisive, indignant, irascible, irate, ireful, keen, mad,
      mordacious, mordant, penetrating, piercing, poignant, quarrelsome,
      rancorous, rankled, resentful, resenting, rigorous, rough,
      scathing, scorching, severe, sharp, sore, splenetic, stabbing,
      stewing, stinging, strident, stringent, tart, testy, trenchant,
      vehement, violent, virulent, vitriolic, withering, wrathful,
      wrathy, wroth