definition of
bitter

[1] #1 bitter s. [acrimonious] marked by strong resentment or cynicism; "an acrimonious dispute"; "bitter about the divorce". wn

[2] #2 bitter s. very difficult to accept or bear; "the bitter truth"; "a bitter sorrow". wn

[3] #3 bitter s. expressive of severe grief or regret; "shed bitter tears". wn

[4] #4 bitter s. proceeding from or exhibiting great hostility or animosity; "a bitter struggle"; "bitter enemies". wn

[5] #5 bitter r. [piercingly, bitterly, bitingly] extremely and sharply; "it was bitterly cold"; "bitter cold". wn