flippant
adjectiveUK /ˈflɪp.ənt/
US /ˈflɪp.ənt/
Not being serious when you should be.
His flippant answer made the teacher frown.
RELATED WORDS
OTHER MEANINGS
2. Showing a rude lack of respect for something important.
She gave a flippant remark about the ceremony.
3. Treating serious matters in a light or joking way.
It was a flippant comment about a serious problem.
4. Speaking quickly and smoothly without real thought.
His flippant reply showed he had not listened.