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Noun: infantilism  in'fan-tu,li-zum
  1. An abnormal condition in which an older child or adult retains infantile characteristics
    "His emotional infantilism made it difficult for him to form mature relationships"
     
  2. Infantile behaviour in mature persons
    "His infantilism was evident in his inability to handle adult responsibilities"

Derived forms: infantilisms

Type of: abnormalcy [US], abnormality, misbehavior [US], misbehaviour [Brit, Cdn], misdeed, misdoing

Encyclopedia: Infantilism