Definition of youthful:
untried, enthusiastic, novel, youth, unseasoned, athletic, new, keen, new-made, young, late, childlike, new-fangled, new-fashioned, immature, prankish, upstart, vernal, cautious, limber, active, lithe, buoyant, modern, untested, recent, slow, vigorous, lighthearted, full-blooded, infant.
- adolescent (part of speech: adjective)
- young (part of speech: adjective)
- juvenile (part of speech: adjective)
- "The Wandering Jew, Book II.", Eugene Sue.
It is hardly necessary to say that John Milton had not been touched by any personal significance in his companion's speech, whatever she may have intended; and it is equally true that whether she had presently forgotten her purpose, or had become suddenly interested in her own conversation, her face grew more animated, her manner more confidential, and something of the youthful enthusiasm she had shown in the mountain seemed to come back to her.- "A First Family of Tasajara", Bret Harte.
- "Là-bas", J. K. Huysmans.