caprice
词根词缀：
caper v. 欢蹦，跳跃
capr的变体，山羊总爱蹦跳
caprice n. 突变；任性
来自拉丁文capra山羊，山羊吃草会突然跳向一旁，而后又若无其事地继续吃。词义就是从这里引申而来的。
capricious adj. 变化无常的；任性的
capric〔e〕突变；任性（来自拉丁 + ious 有…性质的，关于…的 → 像山羊一样变化无常的 → 变化无常的
数据来源：新东方英语词汇速记大全
相关例句：
The Baron might possibly have perceived it, but, attributing it to a caprice, feigned ignorance.
男爵或许也觉察到她那种态度，但他认为这只是他女儿的怪僻，假装不知道。
Something is the matter with you, caprice.
你真的有点问题，可普莉斯。
If his own vanity, however, did not mislead him, he was the cause, his pride and caprice were the cause, of all that Jane had suffered, and still continued to suffer.
如果彬格莱先生本来并没有给虚荣心冲昏头脑，那么，吉英目前所受的种种痛苦，以及将来还要受下去的痛苦，都得归罪于他，归罪于他的傲慢和任性。
His lack of money was the result of caprice in spending on unnecessary.
他经济上的窘迫是因为他肆意的把钱花在一些没有必要的东西上。
This wasn't a love that depended on chance or caprice, but a love as mighty and eternal as the universe itself.
这不是依赖机会或反复无常的爱，这爱跟宇宙本身一样巨大和永恒。
The individual= s ends will change as he learns from other people; they may also change out of sheer caprice.
人的目的会受他人的影响而改变，也可能干脆反复无常。