not showing a serious or respectful attitude:a flippant remark
early 17th century: from flip1+ -ant, perhaps on the pattern of heraldic terms such as couchant and rampant. Early senses included 'nimble' and 'talkative', hence 'playful', giving rise to the current use 'lacking seriousness'
Remember that the ending of flippant is -ant.
flippant in other Oxford dictionaries
Definition of flippant in the US English dictionary