insoucianceWiktionary 原文中文来自 ECDICTn.无忧无虑演变路径（由近及远）英语借自 ←法语 insouciance词源说明From French insouciance, from in- (“not”) + souciant (“worrying”).释义（英文）名词 NounCarelessness, heedlessness, indifference, or casual unconcern.Nonchalance.