The Oxford Thesaurus An A-Z Dictionary of Synonyms - bitteradj.

1) harsh, acerbic, acrid, sharp, caustic, mordant: I added some cream to the sauce to try and make it taste less bitter. 2) unappetizing, distasteful, unsavoury, unpleasant, hard (to swallow or take) , irritating, obnoxious, disagreeable, nasty, painful, unwelcome, unpalatable: The demand for additional tax payments was a bitter pill. 3) miserable, grievous, dispiriting, distressing, cruel, distressful: Dismissal after all those years in the firm was a bitter experience. 4) resentful, embittered, rancorous; hateful: Andrew felt bitter at not being selected as chairman. 5) stinging, cutting, biting, harsh, reproachful, vicious, acrimonious, virulent; cruel, unkind, unpleasant, nasty: His bitter denunciation of other candidates lost him the campaign. 6) sharp, keen, cutting, severe, biting, cold, wintry, freezing: A bitter gale lashed at the rigging.