adjective · to pass away or expire (often used as a euphemism)

他早已交代好，一旦无常，丧事从简。

idiom · a deity or spirit responsible for taking away the soul after death

民间传说中，黑白无常是专门勾摄生魂的使者。

adverb · the Buddhist concept (Sanskrit: anitya) that all conditioned things are transient

诸行无常是佛法中的重要教义。

idiom · changeable, fickle, or inconsistent in nature

这里的气候变幻无常，出门最好带把伞。