Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun infantilism

2 senses of infantilism

Sense 1
infantilism -- (an abnormal condition in which an older child or adult retains infantile characteristics)
       => abnormality, abnormalcy -- (an abnormal physical condition resulting from defective genes or developmental deficiencies)

Sense 2
infantilism -- (infantile behavior in mature persons)
       => misbehavior, misbehaviour, misdeed -- (improper or wicked or immoral behavior)