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

Encyclopedia: Infantilism

• adolescence
• adolescent
• Adolf Eichmann
• Adolf Hitler
• Adolf Loos
• Adolf Windaus
• Adolph Simon Ochs
• Adolphe Sax
• Adonai
• Adonic
• Adonic line
• adonis
• Adonis annua
• adopt
• adoptable
• adopted
• adoptee
• adopter
• adoption
• adoptive
• adoptive parent
• adorability
• adorable
• adorableness
• adorably