flip·pant 
/ˈflɪpənt/ adjective
/ˈflɪpənt/ adjective [more flippant; most flippant] : lacking proper respect or seriousness
▪ He made/gave a flippant response to a serious question.
▪ He made/gave a flippant response to a serious question.
— flip·pan·cy /ˈflɪpənsi/ noun [noncount]
▪ Many people were offended by the flippancy of his responses.
/ˈflɪpənsi/ noun [noncount] ▪ Many people were offended by the flippancy of his responses.
— flip·pant·ly adverb
▪ He responded flippantly.
▪ He responded flippantly.
