Irreverent (adjective)

Showing a lack of respect for something or someone considered sacred or serious; disrespectful.

Origin:

From latin irreverentem (nominative irreverens) "not showing proper respect or reverence; disrespectful", from in- "not" + reverentem (nominative reverens) "showing reverence".

Examples:

1. She had an irreverent sense of humor and often made jokes about serious subjects.
2. He had an irreverent attitude towards authority figures.
3. The play was irreverent and irreverently fun.
4. The irreverent tone of the book made it an instant hit among young readers.
5. He was known for his irreverent, often controversial, and always entertaining speeches.