Meaning of “nonchalant” in the English Dictionary

"nonchalant" in British English

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nonchalantadjective

uk /ˈnɒn.ʃəl.ənt/ us /ˌnɑːn.ʃəˈlɑːnt/
nonchalance
noun [ U ] uk /ˈnɒn.ʃəl.əns/ us /ˌnɑːn.ʃəˈlɑːns/
nonchalantly
adverb uk /ˈnɒn.ʃəl.ənt.li/ us /ˌnɑːn.ʃəˈlɑːnt.li/

(Definition of “nonchalant” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"nonchalant" in American English

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nonchalantadjective [ not gradable ]

us /ˌnɑn·ʃəˈlɑnt/

behaving in a calm manner, showing that you are not worried or frightened:

She waited her turn to audition, trying to look nonchalant.
nonchalance
noun [ U ] us /ˌnɑn·ʃəˈlɑns/
nonchalantly
adverb [ not gradable ] us /ˌnɑn·ʃəˈlɑnt·li/

Once on a safari Charles found 14 female lions walking nonchalantly across an open field.

(Definition of “nonchalant” from the Cambridge Academic Content Dictionary © Cambridge University Press)