infantilism

/ˌɪnfəntlˈɪzəm/
IPA guide

Definitions of infantilism
  1. noun
    infantile behavior in mature persons
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    type of:
    misbehavior, misbehaviour, misdeed
    improper or wicked or immoral behavior
  2. noun
    an abnormal condition in which an older child or adult retains infantile characteristics
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    types:
    ateleiosis, ateliosis
    a form of infantilism characterized by physical underdevelopment but normal intelligence
    type of:
    abnormalcy, abnormality
    an abnormal physical condition resulting from defective genes or developmental deficiencies
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