Definitions:

1. Describes treating serious issues with deliberatly inappropriate humor. NOUN
   • While his facetiousness was usually entertaining, it was out of place during the emergency meeting.
2. Involves a flippant attitude that can be humorous but may not always be appropriate for the situation. NOUN
   • His facetiousness often brought laughter to the group, though sometimes it was misunderstood.
3. Involves making jokes or comments in situations where it may not be suitable or proper, often with a sense of irony or sarcasm. NOUN
   • The teacher's facetiousness made the lessong more enjoyable, but some students found it hard to tell when he was serious.

Synonyms:

• flippancy
• irreverence
• jocularity
• playfulness
• sarcasm