- infantilism - an abnormal condition in which an older child or adult retains infantile characteristics
--1 is a kind of abnormality, abnormalcy, abnormal condition
--1 has particulars: ateleiosis, ateliosis- infantilism - infantile behavior in mature persons
--2 is a kind of misbehavior, misbehaviour, misdeed
- infantilism - infantile behavior in mature persons