silliness
1. [ noun ] a ludicrous folly
Synonyms: absurdity fatuousness fatuity
Examples:

"the crowd laughed at the absurdity of the clown's behavior"

Related terms: folly
2. [ noun ] an impulsive scatterbrained manner
Synonyms: giddiness
Related terms: frivolity lightsomeness
Similar spelling:   Silenus
  silence
  silencer
  silenced
  Sullins