caprice /kəˈpriːs/ Noun. [countable ] a sudden change in attitude or behaviour for no obvious reason （态度或行为的）无缘无故突变，反覆无常；任性 SYN whim
If I burden myself with a little helpmate during my adventures, this is not out of sentiment or caprice, it is that he has many fine qualities of his own, that he has overlooked in his obsession with me.
capricious / kəˈprɪʃəs/ adjective. ( formal) showing sudden changes in attitude or behaviour （态度或行为）反覆无常的；任性的 SYN unpredictable
capriciously adv.
For example, " Despite the capricious nature of our marketing department, the campaign was a roaring success."
She is capricious.
,
