bitter adj
1 having or denoting an unpalatable harsh taste, as the peel of an orange or coffee dregs
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sour →
1
2 showing or caused by strong unrelenting hostility or resentment: he was still bitter about the divorce
3 difficult or unpleasant to accept or admit
a bitter blow
4 cutting; sarcastic
bitter words
5 bitingly cold
a bitter night
adv
6 very; extremely (esp. in the phrase bitter cold) n
8 (Brit) beer with a high hop content, with a slightly bitter taste vb
9 to make or become bitter, (See also)
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bitters (Old English biter; related to bitan to bite)
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bitterly adv
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bitterness n