Etymology
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insouciant (adj.)

1828, from French insouciant "careless, thoughtless, heedless," from in- "not" (see in- (1)) + souciant "caring," present participle of soucier "to care," from Latin sollicitare "to agitate" (see solicit). Related: Insouciantly.

updated on December 13, 2015

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Definitions of insouciant from WordNet

insouciant (adj.)
marked by blithe unconcern;
an utterly insouciant financial policy
an elegantly insouciant manner
Synonyms: casual / nonchalant
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.