“任性的”的英语可以翻译为：capricious，headstrong，unruly，wilful，impulsive ...

她是个任性的孩子.She was a willful child.舍不得回家的并不限于任性的男客.The reluctance to go home was not confined to wayward men.优秀的情感和责任劝告她控制住自己任性的情绪.Good sense and duty counseled her to control her wayward spirit....