unseriousness
/ˌʌnˈsɪriəsnəs/
noun
- The quality or state of not being serious; lack of earnestness or importance.
- His unseriousness during the meeting made it hard to get any work done.
- The teacher was frustrated by the class's unseriousness about the upcoming exam.
- Despite the unseriousness of the topic, the comedian delivered it with perfect timing.
Antonyms