Definition of nonchalant adjective from the Oxford Advanced Learner's Dictionary



BrE BrE//ˈnɒnʃələnt//
; NAmE NAmE//ˌnɑːnʃəˈlɑːnt//
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behaving in a calm and relaxed way; giving the impression that you are not feeling any anxiety synonym casual to appear/look/sound nonchalant ‘It'll be fine,’ she replied, with a nonchalant shrug. Word Originmid 18th cent.: from French, literally ‘not being concerned’, from the verb nonchaloir.Extra examples She was almost nonchalant about the dangers involved. ‘They’re not back yet then?’ She tried to sound nonchalant. He tried to appear nonchalant about the risks he was taking. She gave a nonchalant shrug.
See the Oxford Advanced American Dictionary entry: nonchalant