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Marked by blithe unconcern; nonchalant.
[French : in-, not (from Old French; see in-1) + souciant, present participle of soucier, to trouble (from Old French, from Vulgar Latin *sollicītāre, alteration of Latin sollicitāre, to vex; see solicit).]
carefree or unconcerned; light-hearted
[C19: from French, from in-1 + souciant worrying, from soucier to trouble, from Latin sollicitāre; compare solicitous]
in•sou•ci•ant(ɪnˈsu si ənt; Fr. ɛ̃ suˈsyɑ̃)
free from concern, worry, or anxiety; carefree; nonchalant.
[1820–30; < French, =in- in-3 + souciant, present participle of soucier to worry < Vulgar Latin *sollicītāre, for Latin sollicitāre to disturb; see solicit]
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|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"|
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"