Insouciant

[ in-soo-see-uhnt ]
adjective

Marked by blithe unconcern; nonchalant.

Heedless of consequences or of the future; indifferent; unconcerned.

Kelly longed to be an insouciant child again so she could avoid her adult responsibilities.

SYNONYMS

carefreecarelesscasuallyheedlessimperturbableindifferentnonchalantunconcernedunfazed