Synonyms of youthful

1 Syllable

green, keen, greens, boyish, young, buoyant, fresh, new

2 Syllables

greenest, childish, freshest, vernal, youngest, tender, brandnew, baby, preadult, younger, newer, undried, fresher, verduous, budding, callow, girlish, half-grown, newish, wide-eyed, wellmeant, greener, beardless, milk-fed, newest, infant, springer, kidstuff

3 Syllables

active, childlike, pubescent, half-formed, puerile, foliate, boylike, girllike, vigorous, pre-adult, innoxious, unweaned, untrodden

4 Syllables

underage, enthusiastic, juvenile, infantine, infantile, immature, unmalicious, uninjurious, unsuspicious, adolescent

5 Syllables

well-intentioned, inexperienced

6 Syllables

uncontaminated