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non·cha·lant·ly | \ ˌnän-shə-ˈlänt-lē 
; ˈnän-shə-ˌlänt-, -lənt- \
; ˈnän-shə-ˌlänt-, -lənt- \Definition of nonchalantly
: in a nonchalant manner : in a casual way that shows a relaxed lack of concern or interest
She nonchalantly glanced our way. He walked nonchalantly to his seat. According to its site, the center's outdoor summer programming organizers nonchalantly wondered in 2012 if an evening screening cat videos would attract any attention.— Kate Whittle
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Time Traveler for nonchalantly
The first known use of nonchalantly was in 1836
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