bitterest

1. marked by strong resentment or cynicismExamples: "an acrimonious dispute"; "bitter about the divorce"Synonyms: acrimonious, bitter

2. very difficult to accept or bearExamples: "the bitter truth"; "a bitter sorrow"Synonyms: bitter

3. harsh or corrosive in toneExamples: "an acerbic tone piercing otherwise flowery prose"; "a barrage of acid comments"; "her acrid remarks make her many enemies"Synonyms: acerb, acerbic, acid, acrid, bitter, blistering, caustic, sulfurous

4. expressive of severe grief or regretExamples: "shed bitter tears"Synonyms: bitter

5. proceeding from or exhibiting great hostility or animosityExamples: "a bitter struggle"; "bitter enemies"Synonyms: bitter

6. causing a sharp and acrid taste experienceExamples: "quinine is bitter"Synonyms: bitter