Frivolity often implies a lighthearted or carefree attitude that might not be taken seriously. The frivolity in her voice suggested she wasn't concerned about the exam results.
Pro Tip 2/3
In Professional Contexts
Use 'frivolity' with caution in formal or professional settings as it may be seen as irresponsibility. The board meeting had no room for frivolity; it was serious business.
Pro Tip 3/3
Negative Connotation
Frivolity can carry a negative connotation, suggesting silliness or lack of maturity. His constant frivolity at work cost him a promotion.