flippancy (noun)

1. During a solemn memorial service, he made a flippant remark about a tragic event in history.

2. The cartoon character's flippancy often entertained viewers with its lighthearted and humorous approach.

3. Her partner's flippancy about their relationship issues left her feeling hurt and unheard.

4. His witty joke was received with laughter, but some found his flippancy offensive.