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

     

    childishness

     noun
    noun
    BrE BrE//ˈtʃaɪldɪʃnəs//
     
    ; NAmE NAmE//ˈtʃaɪldɪʃnəs//
     
    [uncountable]
     
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  1. 1the quality of being typical of a child His face is a fascinating mixture of childishness and maturity. opposite maturity (2)
  2. 2(disapproving) the quality in an adult of thinking and behaving in a stupid or silly way synonym immaturity (1) I felt frustrated at the sheer childishness of my teammates. opposite maturity (1)