Longman Dictionary of Contemporary English homepage

Date: 1700-1800
Language: French
Origin: Old French nonchaloir 'to pay no attention to', from Latin calere 'to be warm'

nonchalant

adjective
     
non‧cha‧lant
behaving calmly and not seeming interested in anything or worried about anything:
'Has he got a girlfriend?' Jill asked, trying to sound nonchalant.
nonchalance noun [uncountable]
nonchalantly adverb:
He smiled nonchalantly.

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