Etymology
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bitterness (n.)

Old English biternys "bitterness, grief;" see bitter + -ness. Figurative sense (of feelings, etc.) is attested earlier than literal sense (of taste), which will surprise no one who reads any amount of Anglo-Saxon literature.

updated on October 14, 2021

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Definitions of bitterness from WordNet

bitterness (n.)
a feeling of deep and bitter anger and ill-will;
Synonyms: resentment / gall / rancor / rancour
bitterness (n.)
a rough and bitter manner;
Synonyms: acrimony / acerbity / jaundice / tartness / thorniness
bitterness (n.)
the taste experience when quinine or coffee is taken into the mouth;
Synonyms: bitter
bitterness (n.)
the property of having a harsh unpleasant taste;
Synonyms: bitter
From wordnet.princeton.edu, not affiliated with etymonline.