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From The Collaborative International Dictionary of English v.0.48:
Youthful \Youth"ful\, a. 1. Not yet mature or aged; young. "Two youthful knights." --Dryden. Also used figuratively. "The youthful season of the year." --Shak. [1913 Webster] 2. Of or pertaining to the early part of life; suitable to early life; as, youthful days; youthful sports. "Warm, youthful blood." --Shak. "Youthful thoughts." --Milton. [1913 Webster] 3. Fresh; vigorous, as in youth. [1913 Webster] After millions of millions of ages . . . still youthful and flourishing. --Bentley. [1913 Webster] Syn: Puerile; juvenile. Usage: Youthful, Puerile, Juvenile. Puerile is always used in a bad sense, or at least in the sense of what is suitable to a boy only; as, puerile objections, puerile amusements, etc. Juvenile is sometimes taken in a bad sense, as when speaking of youth in contrast with manhood; as, juvenile tricks; a juvenile performance. Youthful is commonly employed in a good sense; as, youthful aspirations; or at least by way of extenuating; as, youthful indiscretions. "Some men, imagining themselves possessed with a divine fury, often fall into toys and trifles, which are only puerilities." --Dryden. "Raw, juvenile writers imagine that, by pouring forth figures often, they render their compositions warm and animated." --Blair. [1913 Webster] -- Youth"ful*ly, adv. -- Youth"ful*ness, n. [1913 Webster]