flippantly
adverbUK /ˈflɪp.ənt.li/
US /ˈflɪp.ənt.li/
In a way that shows you are not being serious or respectful.
She answered the teacher's question flippantly and got in trouble.
OTHER MEANINGS
2. In a light and joking way that does not treat something as important.
He joked flippantly about losing his keys.
3. In a rude way that shows little respect for someone or something.
The reporter spoke flippantly about the mayor's serious plan.
4. In a quick, offhand manner without much thought.
She flippantly waved away the warning.