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.
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