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.

// The young actor charmed interviewers with his easy smile and devil-may-care insouciance.

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“Gladiator II is OK when Denzel’s off-screen, but sensational when he’s on it. ... What makes the performance great is its insouciance; 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

If you were alive and of whistling age in the late 1980s or early 1990s, chances are you whistled (and snapped your fingers, and tapped your toes) to a little ditty called “Don’t Worry, Be Happy” by Bobby McFerrin, an a cappella reggae-jazz-pop tune that took the charts by surprise and by storm. An ode to cheerful insouciance if ever there was one, its lyrics are entirely concerned with being entirely unconcerned, remaining trouble-free in the face of life’s various stressors and calamities. Such carefree nonchalance is at the heart of insouciance, which 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.” The easiness and breeziness of insouciance isn’t always considered beautiful, however. Insouciance may also be used when someone’s lack of concern for serious matters is seen as more careless than carefree.