Synonyms for youthful

modified

1. Possessing youth

   young, childlike, adolescent; see active 2, juvenile 1.

2. Suited to youth

   keen, enthusiastic, zestful, vigorous, active, buoyant, lighthearted, prankish, fresh, lithe, full-blooded, full of life, full of animal spirits, limber, athletic, lightfooted, bubbling over, full of the devil*; see also modern 1.

   Antonyms slow*, cautious, serious. See syn. study at young.young.