mischievous (adj.)youdaoicibaDictYouDict[mischievous 词源字典]
early 14c., "unfortunate, disastrous," probably from mischief + -ous. Sense of "playfully malicious or annoying" first recorded 1670s. Related: Mischievously; mischievousness.[mischievous etymology, mischievous origin, 英语词源]