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childish adjective

  /ˈt͡ʃaɪldɪʃ/
  • Immature in thought or behaviour.
 puéril, gamin
  • belonging to or suitable for a child.
 enfantin, puéril

childishness noun

  /ˈt͡ʃaɪld.ɪʃ.nəs/ , /ˈt͡ʃaːld.ɪʃ.nəs/ , /ˈt͡ʃaːld.ɪʃ.nɪs/
  • (countable) Childish behaviour.
 enfantillage
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