Origin of insouciantFrench from in-, not + souciant, present participle of soucier, to regard, care from Classical Latin sollicitare: see solicit
An example of an insouciant person is someone sitting by the pool and sipping a cocktail while on vacation.
Origin of insouciantFrench 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 . )
(comparative more insouciant, superlative most insouciant)
From French insouciant from in- (“not”) + souciant (“worrying”)