adjective
frivolous
FRIV-uh-lus/ˈfrɪvələs/
Not serious or deserving much attention.
We set aside frivolous complaints and focus on real problems.

Etymology
Latin frivolus described things as silly, empty, or worthless. The modern adjective preserves that judgment of little value, applying it to behavior or ideas considered insufficiently serious to merit attention.
In context
fun can seem maybe frivolous in a very serious world, and the world is quite serious.
More examples
- Their frivolous conversation keeps the mood light.
- Buying another fancy hat seems frivolous when money is tight.
- The judge dismisses the frivolous lawsuit.
Forms
frivolous · more frivolous · most frivolous
frivolity noun — Behavior or activity that lacks seriousness.
frivolously adverb — In a way that lacks seriousness.