Definition of "Bitter" :

noun: the property of having a harsh unpleasant taste

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

noun: English term for a dry sharp-tasting ale with strong flavor of hops (usually on draft)

verb: make bitter

adjective: marked by strong resentment or cynicism

"Bitter about the divorce."

adjective: proceeding from or exhibiting great hostility or animosity

"A bitter struggle."

adjective: expressive of severe grief or regret

"Shed bitter tears."

adjective: causing a sharply painful or stinging sensation; used especially of cold

"Bitter cold."

adjective: harsh or corrosive in tone

"Bitter words."

adjective: causing a sharp and acrid taste experience

"Quinine is bitter."

adjective: very difficult to accept or bear

"The bitter truth."

adverb: extremely and sharply

"It was bitterly cold."