caprice /kəˈpriːs/ TEM8

• 1. 

  N-VAR A caprice is an unexpected action or decision which has no strong reason or purpose. 反复无常; 任性善变 [正式]

  例：

  I lived in terror of her sudden caprices and moods.

  她任性易变喜怒无常，让我整天提心吊胆。