"bitterer" in the adjective sense

1. acrimonious, bitter

marked by strong resentment or cynicism

"an acrimonious dispute"

"bitter about the divorce"

2. bitter

very difficult to accept or bear

"the bitter truth"

"a bitter sorrow"

3. acerb, acerbic, acid, acrid, bitter, blistering, caustic, sulfurous, sulphurous, virulent, vitriolic

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 and medical ethics"

"a sulfurous denunciation"

"a vitriolic critique"

4. bitter

expressive of severe grief or regret

"shed bitter tears"

5. bitter

proceeding from or exhibiting great hostility or animosity

"a bitter struggle"

"bitter enemies"

6. bitter

causing a sharp and acrid taste experience

"quinine is bitter"

7. biting, bitter

causing a sharply painful or stinging sensation used especially of cold

"bitter cold"

"a biting wind"

Source: WordNet® (An amazing lexical database of English)

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