Insouciant: [in-soo-see-uhnt; Fr. an-soo-syahn]
free from concern, worry, or anxiety; carefree; nonchalant.
Cats do this word particularly well. There’s just something in their nature that lends itself to utter chill-out-a-tude.
More power to them, I wish I found myself in a state of insouciance more often. Say it outloud, the word even sounds like it’s lying down.