Synonyms of childish in English:

childish


See US English definition of childish

See UK English definition of childish

See Spanish definition of infantil

adjective

1‘it was childish of her to rip up the picture’

SYNONYMS
immature, babyish, infantile, juvenile, puerile
silly, inane, fatuous, jejune, foolish, stupid, irresponsible, naive
ANTONYMS

mature

2‘she had a round childish face’

SYNONYMS
childlike, youthful, young, young-looking, girlish, boyish, children's, child's, adolescent, teenaged, teenage
archaic bread-and-butter
ANTONYMS

adult