1. resentment, bitterness, gall, rancor, rancour, hostility, enmity, ill will

usage: a feeling of deep and bitter anger and ill-will

2. bitterness, acrimony, acerbity, jaundice, tartness, thorniness, disagreeableness

usage: a rough and bitter manner

3. bitter, bitterness, taste, taste sensation, gustatory sensation, taste perception, gustatory perception

usage: the taste experience when quinine or coffee is taken into the mouth

4. bitterness, bitter, taste property

usage: the property of having a harsh unpleasant taste

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