Definition of infantile adjective from the Oxford Advanced Learner's Dictionary

     

    infantile

     adjective
    adjective
    BrE BrE//ˈɪnfəntaɪl//
     
    ; NAmE NAmE//ˈɪnfəntaɪl//
     
    Youth
     
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  1. 1(disapproving) typical of a small child (and therefore not suitable for adults or older children) synonym childish infantile jokes See related entries: Youth
  2. 2[only before noun] (formal or specialist) connected with babies or very young children
  3. Word Origin late Middle English: from French, or from Latin infantilis, from infans, infant- ‘unable to speak’, from in- ‘not’ + fant- ‘speaking’ (from the verb fari).
See the Oxford Advanced American Dictionary entry: infantile