"bitterness" in the noun sense
1. resentment, bitterness, gall, rancor, rancour
a feeling of deep and bitter anger and ill-will
2. bitterness, acrimony, acerbity, jaundice, tartness, thorniness
a rough and bitter manner
3. bitter, bitterness
the taste experience when quinine or coffee is taken into the mouth
4. bitterness, bitter
the property of having a harsh unpleasant taste
Source: WordNet® (An amazing lexical database of English)
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