insouciant

in·sou·ci·ant  (n-ss-nt, s-syä)

adj.

Marked by blithe unconcern; nonchalant.

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[French : in-, not (from Old French; see in-¹) + souciant, present participle of soucier, to trouble (from Old French, from Vulgar Latin *sollictre, alteration of Latin sollicitre, to vex; see solicit).]

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in·souci·ant·ly adv.

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insouciant

Adjective

carefree or unconcerned [French]

insouciance n

Thesaurus

Adj.

1.

insouciant - marked by blithe unconcern; "an ability to interest casual students"; "showed a casual disregard for cold weather"; "an utterly insouciant financial policy"; "an elegantly insouciant manner"; "drove his car with nonchalant abandon"; "was polite in a teasing nonchalant manner" casual, nonchalant unconcerned - lacking in interest or care or feeling; "the average American...is unconcerned that his or her plight is the result of a complex of personal and economic and governmental actions...beyond the normal citizen's comprehension and control"; "blithely unconcerned about his friend's plight"