childish - definition and synonyms

 
adjective 

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/ˈtʃaɪldɪʃ/
  1. 1
    behaving in a silly and annoying way, like a small child
     Synonyms and related words
    1. a.
      used about behaviour that is not reasonable or sensible

      a childish outburst of temper

      It’s simply childish to refuse to talk to her.

  2. 2
    typical of a child or of the things children do

    She wrote with large, childish letters.

derived words

childishness

noun [uncountable]