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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
  2. Infantile behaviour in mature persons

Derived forms: infantilisms

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

Encyclopedia: Infantilism