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"bitterness" is also used as a crossword clue. If that's what you saw, the answer is often acrimony (8 letters).
Definitions
Bitter taste or a resentful feeling.
Word origin
From Middle English bitternesse, biternesse, from Old English biternes (“bitterness; grief”), equivalent to bitter + -ness.
Used in a sentence
“the bitterness of his words”
“She kept her bitterness about her mistreatment for the rest of her life.”
“Speaking of the guest list, though, it is most disappointing to find some of the third tier European princelings unable to hide their bitterness at being NFI.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Sharp taste”10 letters
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