caprice
noun [ C or U ] literary uk/kəˈpriːs/ us/kəˈpriːs/
异想天开;反复无常;突发奇想
(the quality of often having) a sudden and usually silly wish to have or do something, or a sudden and silly change of mind or behaviour
The $300 million palace was built to satisfy the caprice of one man. 用3亿美元建这座宫殿就是为了满足一个人的心血来潮。
Synonyms: impulsewhim