Etymology

insouciance

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Today it means: Carelessness, heedlessness, indifference, or casual unconcern. Full definition →

French insouciance
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The story

  1. French · borrowed frominsouciance
  2. English todayinsouciance

From French insouciance, from in- (“not”) + souciant (“worrying”).

Etymology from Wiktionary, CC BY-SA 4.0.