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English definition of “nonchalant”

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adjective uk   /ˈnɒn.ʃəl.ənt/ us    /ˌnɑːn.ʃəˈlɑːnt/
behaving in a calm manner, often in a way that suggests you are not interested or do not care: a nonchalant manner/shrug
noun [U] uk   /ˈnɒn.ʃəl.əns/ us    /ˌnɑːn.ʃəˈlɑːns/
adverb uk   /-li/ us  
(Definition of nonchalant from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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