Definition of insouciance noun from the Oxford Advanced American Dictionary

 

insouciance

 noun
noun
NAmE//ɪnˈsusiəns//
 
[uncountable](formal)
 
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the state of not being worried about anything She hid her worries behind an air of insouciance.
NAmE//ɪnˈsusiənt//
 
adjective synonym nonchalant
See the Oxford Advanced Learner's Dictionary entry: insouciance