insouciance (n.)youdaoicibaDictYouDict[insouciance 词源字典]
1799, from French insouciant "carelessness, thoughtlessness, heedlessness," from in- "not" (see in- (1)) + se soucier "to care," from Latin sollicitare "to agitate" (see solicit).[insouciance etymology, insouciance origin, 英语词源]