insouciance

Definitions

A casual lack of concern; indifference.

A state of lighthearted unconcern or nonchalance.

Examples

He faced the daunting challenge with a surprising air of insouciance, as if the outcome were of no consequence at all.

Her youthful insouciance often irritated her more serious colleagues, who felt she did not take the project's deadlines seriously enough.

Synonyms

indifference nonchalance unconcern apathy detachment carefreeness equanimity

Antonyms

anxiety concern apprehension worry solicitude nervousness unease