infantile
Translation
infantile, childish, immature
Examples
His behaviour was quite infantile.
His behavior was quite infantile.
She complained about his infantile jokes.
She complained about his infantile jokes.
Grammar Patterns
infantile ((behavior/person)) childish or immature His infantile behavior is annoying.
Similar Words
Synonyms: childish, immature, juvenile; Antonyms: mature, adult
Etymology
From Latin 'infantilis', from 'infans' (see 'infant'). The '-ile' suffix means 'relating to' or 'capable of'.
Memory Tips
Means 'like an infant', but it's often used negatively to describe an adult behaving like a child.