insouciance
n.
1799, from French insouciant "carelessness, thoughtlessness, heedlessness," from in- "not" (see in-(1)) + se soucier "to care," from Latin sollicitare "to agitate" (see solicit).
| 词汇 | insouciance | 
| 词根词缀 | Online Etymology Dictionary insouciance n. 1799, from French insouciant "carelessness, thoughtlessness, heedlessness," from in- "not" (see in-(1)) + se soucier "to care," from Latin sollicitare "to agitate" (see solicit). | 
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