insouciant

adjective

in·​sou·​ciant -sēənt 

-shənt, 

F -syäⁿ

: exhibiting or characterized by insouciance

an insouciant manner

… a wonderfully slouching lounge lizard, a swaggering insouciant Don Juan straight out of Capital City.

—Paul Preston, The (London) Times Literary Supplement, 14 Dec. 1990

insouciantly

-sēəntlē 

-shən-, 

-li

adverb

Word History

Etymology

French, from in- in- entry 1 + souciant, present participle of soucier

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