Etymology
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nonchalance (n.)

"coolness, indifference, unconcern," 1670s, from French nonchalance (13c.), from nonchalant "careless" (see nonchalant).

updated on July 08, 2019

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Definitions of nonchalance from WordNet

nonchalance (n.)
the trait of remaining calm and seeming not to care; a casual lack of concern;
Synonyms: unconcern / indifference
From wordnet.princeton.edu, not affiliated with etymonline.