1. The children were acting silly, making funny faces and laughing uncontrollably.
2. I can't believe she fell for that silly prank, it was so obvious.
3. Don't be so silly, of course I didn't mean it in a bad way.
4. He made a silly mistake on his test and ended up getting a lower grade.
5. It's just a silly superstition, there's no need to worry about it.
6. She wore a silly hat to the party, just for fun.
7. The comedian's silly jokes had the audience in stitches.
8. Stop being so silly and focus on the task at hand.
9. The movie was a silly comedy, perfect for a night of mindless entertainment.
10. I can't believe you forgot your keys again, you're so silly sometimes.