lacking proper respect or seriousness
If you are ‘flippant’ about something then you are not treating it with the respect that it deserves, or that somebody else thinks it deserves. Often this is done in a misguided attempt to be clever or humorous rather than as a deliberately rude or callous act. Either way, behaving in such a manner generally causes offence, so the word is used solely in a negative context.
It’s easy for you to be flippant about the situation. It’s not your job that’s on the line here!
The flippancy of some of Carol’s remarks may give the impression that she doesn’t care. In fact, they mask her real drive and determination.
That politician is facing an intense public backlash for the way she flippantly referred to the recent terrorist attack.