Casually or smugly indifferent; nonchalant.
Webster's New World
Origin of Insouciant
French in- not (from Old French in–1) souciant present participle of soucier to trouble (from Old French) (from Vulgar Latin sollicītāre) (alteration of Latin sollicitāre to vex solicit)
From American Heritage Dictionary of the English Language, 5th Edition
From French insouciant from in- (“not”) + souciant (“worrying”)
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