infantile
Translation
infantile, childish, immature
Examples
His infantile behavior is not appropriate for his age.
His infantile behaviour is not appropriate for his age.
The patient showed signs of infantile regression.
The patient showed signs of infantile regression.
Grammar Patterns
infantile ((noun)) childish, immature His infantile behavior is not appropriate.
Similar Words
Synonyms: childish, juvenile, immature; Antonyms: mature, adult
Etymology
From Latin 'infantilis', from 'infans' (infant, one who cannot speak), from 'in-' (not) + 'fari' (to speak).
Memory Tips
Think of an 'infant' acting in a silly way. The word describes behaviour that is like that of an infant.