Synonyms for bitterness

noun

1. The quality of being bitter to the tongue

   tartness, piquancy, pungency, astringency, acidity, acerbity, sourness, acridity, brackishness, brininess, sharpness, harshness.

   Antonyms sweetness*, blandness, delectability.

2. The quality of being bitter to the mind

   pain, painfulness, virulence, anguish, agony, grievousness, mordancy, venom, harshness, acrimony, rancor, resentment, gall, cynicism, acerbity, asperity, embitterment, hostility; see also distress 1, rancor, resentment.

   Antonyms solace, balm*, enjoyment.