adjective
1.
Synonyms: acrid , amaroidal, austere, harsh, sharp
Related Word: acerb, acid, bitterish
Contrasted words: delicious; bland, flat, insipid
2.
difficult to accept mentally
the bitter truth
Synonyms: afflictive, distasteful, galling, grievous, painful, unpalatable
Related Word: annoying, distressing, disturbing, woeful; bad, disagreeable, displeasing, offensive, unpleasant; galling, provoking, vexatious
Contrasted words: agreeable, gratifying, satisfying
3.
marked by intense animosity
bitter contempt
Synonyms: antagonistic, hostile, rancorous, virulent, vitriolic
Related Word: alienated, divided, estranged; irreconcilable
4.
Synonyms: severe 3, brutal, hard, harsh, inclement, intemperate, rigorous, rugged
Contrasted words: mild, springlike, summery