bitter

adjective

1
marked by strong resentment or cynicism
an acrimonious dispute
bitter about the divorce
2
proceeding from or exhibiting great hostility or animosity
a bitter struggle
bitter enemies
3
expressive of severe grief or regret
shed bitter tears
4
causing a sharply painful or stinging sensation; used especially of cold
bitter cold
a biting wind
5
harsh or corrosive in tone
an acerbic tone piercing otherwise flowery prose
a barrage of acid comments
6
causing a sharp and acrid taste experience
quinine is bitter
7
very difficult to accept or bear
the bitter truth
a bitter sorrow

1
the property of having a harsh unpleasant taste
2
the taste experience when quinine or coffee is taken into the mouth
3
English term for a dry sharp-tasting ale with strong flavor of hops (usually on draft)

Also useful for “bitter”:Unscrambler— Rearrange the letters in “bitter”