Definition of silliness noun from the Oxford Advanced Learner's Dictionary

     

    silliness

     noun
    noun
    BrE BrE//ˈsɪlinəs//
     
    ; NAmE NAmE//ˈsɪlinəs//
     
    [uncountable]
     
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  1. 1behaviour that shows a lack of thought, understanding or judgement synonym foolishness Stop this silliness and get back to work!
  2. 2the quality of being stupid or embarrassing, especially in a way that is more typical of a child than an adult synonym ridiculousness Children love the sheer silliness of his poems.