perversity (n.)youdaoicibaDictYouDict[perversity 词源字典]
1520s, from Middle French perversité "depravity, degeneracy" (12c.), from Latin perversitatem (nominative perversitas) "forwardness, untowardness," from perversus (see perverse).[perversity etymology, perversity origin, 英语词源]