喜怒无常，汉语成语，一会儿高兴，一会儿发怒。形容人情绪变化不定。可以翻译为“be moody，be subject to changing moods 或 be given to capricious moods”。

例句：

喜怒无常的人很难打交道。

Moody people are very difficult to deal with.

她是个喜怒无常的女人，不容易与别人相处。

She is a woman of incalculable moods, who cannot get along with others.