Definition of: youthful

(yth′fəl) adjective
1. Pertaining to youth; characteristic of youth; hence, buoyant; fresh; vigorous.
2. Having youth; being still young; immature.
3. Not far advanced; early; new.
4. Geol. Young.
—youth′ful·ly adverb
—youth′ful·ness noun Synonyms: boyish, childish, childlike, girlish, juvenile, puerile, young. Boyish, childish, and girlish are used in a good sense of those to whom they properly belong, but in a bad sense of those from whom more maturity is to be expected; childish eagerness or glee is pleasing in a child, but unbecoming in a man; puerile in modern use is distinctly contemptuous. Juvenile and youthful are commonly used in a favorable and kindly sense in their application to those still young; youthful may have a favorable import as applied to any age, as when we say the old man still retains his youthful ardor, vigor, or hopefulness: juvenile in such use would belittle the statement.See FRESH, NEW.