How to Say "childish" in Spanish
The most common Spanish word for “childish” is “infantil” — use 'infantil' when describing behavior that is immature or inappropriate for an adult, often with a slightly negative connotation.
infantil
een-fahn-TEELin.fanˈtil

Examples
No seas infantil, compórtate como un adulto.
Don't be childish; behave like an adult.
Tuvimos una discusión muy infantil sobre quién usaría el control remoto.
We had a very silly argument about who would use the remote control.
Su excusa era tan infantil que nadie la creyó.
His excuse was so childish that no one believed it.
Using 'Ser' vs. 'Estar'
When describing someone's typical personality, use 'ser' (e.g., 'Él es infantil'). If describing a temporary behavior, you might use 'estar' (e.g., 'Hoy estás muy infantil').
inmaduro
een-mah-DOO-rohinmaˈðuɾo

Examples
Él es muy inmaduro para su edad.
He is very immature for his age.
Fue un comentario inmaduro por su parte.
It was a childish comment on his part.
A veces actúas de forma inmadura.
Sometimes you act in an immature way.
Ser vs. Estar with People
Use 'ser' if being immature is a personality trait. Use 'estar' if someone is just acting immaturely at this specific moment.
Spelling with M
Mistake: “immaduro”
Correction: inmaduro. In Spanish, we use 'in-' as a prefix, not 'im-' like in the English word 'immature'.
Infantil vs. Inmaduro
Related Translations
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