vehemence (n.)youdaoicibaDictYouDict[vehemence 词源字典]
c. 1400, from Old French vehemence, veemence "forcefulness, violence, rashness" or directly from Latin vehementia "eagerness, strength," from stem of vehere (see vehement). Related: Vehemency.[vehemence etymology, vehemence origin, 英语词源]