French word insouciamment comes from French insouciant (Carefree, without worries.), French -ment

Detailed word origin of insouciamment

Dictionary entry	Language	Definition
insouciant	French (fra)	Carefree, without worries.
-ment	French (fra)	Used to form adverbs (from the feminine form of an adjective), most of the time equivalent to the English -wise, -ly. Used to form nouns from verbs, usually of action or state resulting of them. Equivalent to the English -ment.
insouciamment	French (fra)	Blithely. Carelessly.

Words with the same origin as insouciamment