Flippancy (noun)

A lack of respect or seriousness, especially in relation to something considered worthy of reverence or gravity.

Origin:

Late 18th century; earliest use found in the monthly review. from flippant + -cy.

Examples:

1. His flippancy was inappropriate for the situation.
2. The flippancy of the comedian was not well received by the audience.
3. The flippancy of the comment was intended to be humorous.
4. His flippancy towards the subject showed a lack of understanding.
5. The flippancy of her remarks was disconcerting.