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Noun: silliness  si-lee-nus
  1. A ludicrous folly
    "the crowd laughed at the silliness of the clown's behaviour";
    - absurdity, fatuity, fatuousness
  2. An impulsive scatterbrained manner
    - giddiness

Type of: folly, foolishness, frivolity, frivolousness, unwiseness

Encyclopedia: Silliness