Adjective
1. marked by strong resentment or cynicism;
"an acrimonious dispute""bitter about the divorce"2. very difficult to accept or bear;
"the bitter truth""a bitter sorrow"3. 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"4. one of the four basic taste sensations; sharp and disagreeable; like the taste of quinine
5. expressive of severe grief or regret;
"shed bitter tears"6. proceeding from or exhibiting great hostility or animosity;
"a bitter struggle""bitter enemies"7. causing a sharply painful or stinging sensation; used especially of cold;
"bitter cold""a biting wind"