unconcern
Definitions
A lack of interest, worry, or anxiety regarding a particular situation.
A state of indifference or detachment.
Examples
He watched the chaotic scene with an air of complete unconcern.
Her unconcern for the rules often landed her in trouble with the management.
Despite the gravity of the situation, he maintained a look of total unconcern.
Synonyms
apathy indifference detachment insouciance nonchalance aloofness disinterest