Would that we all could be so in all matters.

insouciant (in·sou·ci·ant): / in SOO see uhnt /
adjective

(1) free from worry or anxiety; unconcerned; nonchalance; carefree

[From prefix in- + French souciant, present participle of French soucier meaning “to care or worry,” from Latin sollicitare meaning “to disturb or trouble.”]

Usage: I believe my responsibility to my cats entails nothing less than providing them an insouciant life.