Definition of flippantly adverb from the Oxford Advanced Learner's Dictionary

 

flippantly

 adverb
adverb
BrE BrE//ˈflɪpəntli//
 
; NAmE NAmE//ˈflɪpəntli//
 
 
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in a way that shows you do not take something as seriously as other people think you should ‘Oh dear,’ he said flippantly.