1 caused by anger or hatred 愤怒或憎恨所致的: a bitter quarrel 激烈的争吵

2 bitter (about sth) (used about a person) very unhappy or angry about sth that has happened because you feel you have been treated unfairly （指人）难过，恼怒（因为觉得受到不公正的待遇）: She was very bitter about not getting the job. 她没有得到那份工作心里很难受。

3 causing unhappiness or anger for a long time; difficult to accept 使人难过或愤怒的；难以接受的: Failing the exam was a bitter disappointment to him. 考试不及格使他感到又伤心又失望。I've learnt from bitter experience not to trust him. 我从痛苦经历中学到不能信任他。

4 having a sharp, unpleasant taste; not sweet 苦味的: bitter coffee 苦味的咖啡

5 (used about the weather) very cold （指天气）严寒的: a bitter wind 刺骨的寒风 ➔bitterness noun [U]: The pay cut caused bitterness among the staff. 减薪引起员工的怨恨。