play fast [at fast] and loose; be unsteady; blow hot and cold; change like a weathercock; change one's mind constantly; change one's mind frequently; (he) is always chopping and changing.; repeatedly to change one's attitude towards 短语和例子 反复无常天气 fickle weather; 反复无常的情绪 fickle moods; 反复无常的人 inconstant sort of fellow; chameleon; 这个人反复无常, 很不可靠。 this fellow is always chopping and changing; he's very unreliable