1. [Noun]: the taste experience when quinine or coffee is taken into the mouth

2. [Noun]: the property of having a harsh unpleasant taste

3. [Noun]: English term for a dry sharp-tasting ale with strong flavor of hops (usually on draft)

4. [Adverb]: extremely and sharply; "it was bitterly cold"; "bitter cold"

5. proceeding from or exhibiting great hostility or animosity; "a bitter struggle"; "bitter enemies"

6. causing a sharply painful or stinging sensation; used especially of cold; "bitter cold"; "a biting wind"

7. one of the four basic taste sensations; sharp and disagreeable; like the taste of quinine

8. marked by strong resentment or cynicism; "an acrimonious dispute"; "bitter about the divorce"

9. expressive of severe grief or regret; "shed bitter tears"

10. harsh or corrosive in tone; "an acerbic tone piercing otherwise flowery prose"; "a barrage of acid comments"; "her acrid remarks make her many enemies"; "bitter words"; "blistering criticism"; "caustic jokes about political assassination, talk-show hosts

11. very difficult to accept or bear; "the bitter truth"; "a bitter sorrow"

12. [Verb]: make bitter

1. resentful

2. hostile

3. sorrowful

4. painful

5. unpleasant

6. tasteful

7. intolerable