Synonyms of childish

1 Syllable

green, boyish, young

2 Syllables

grousing, peevish, naive, silly, sillier, youngest, baby, foolish, younger, callow, half-grown, newish, youthful, babyish, elvish, waspy, silliest, kidstuff

3 Syllables

frivolous, light-minded, nonserious, innocent, childlike, fun-loving, boylike, jejune, puerile, unwiser, girllike, kittenish, simplistic

4 Syllables

muddleheaded, juvenile, infantine, infantile, immature, adolescent

5 Syllables

unexperienced

6 Syllables

unsophisticated