“Gladiator II is OK when Denzel’s off-screen, but sensational when he’s on it. ... What makes the performance great is its insouciance [ɪnˈsuːsiəns]; it’s both precise and feather-light. And it’s what a great actor can do when he’s set free to have fun, to laugh at himself a little bit. ... Denzel’s Macrinus is gravitas and comic relief in one package.” — Stephanie Zacharek, Time, 22 Nov. 2024

insouciance
noun [ɪnˈsuːsiəns]

Insouciance is a formal word that refers to a feeling of carefree unconcern. It can also be understood as a word for the relaxed and calm state of a person who is not worried about anything.

...arrived in English (along with the adjective insouciant), from French, in the 1800s. The French word comes from a combining of the negative prefix in- with the verb soucier, meaning “to trouble or disturb.”

English