infantilism

Noun
  1. An abnormal condition in which an older child or adult retains infantile characteristics (synset 114531389)
    is a type of: abnormalcy, abnormality - an abnormal physical condition resulting from defective genes or developmental deficiencies
    subtypes: ateleiosis, ateliosis - a form of infantilism characterized by physical underdevelopment but normal intelligence
  2. Infantile behavior in mature persons (synset 100740170)
    is a type of: misbehavior, misbehaviour, misdeed - improper or wicked or immoral behavior

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