Definition of flippant adjective from the Oxford Advanced American Dictionary

 

flippant

 adjective
adjective
NAmE//ˈflɪpənt//
 
(informal flip)
 
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showing that you do not take something as seriously as other people think you should a flippant answer/attitude Sorry, I didn't mean to sound flippant. You can't afford to be flippant about such matters.
NAmE//ˈflɪpənsi//
 
noun [uncountable] His flippancy conceals a deep insecurity.
 
adverb “What a shame,” he said flippantly.
See the Oxford Advanced Learner's Dictionary entry: flippant