/ Dictionary / Index Y youthful: Meaning and Definition of Find definitions for: youth•ful Pronunciation: (yth'ful), [key] — adj. characterized by youth; young. of, pertaining to, or befitting youth: youthful enthusiasm. having the appearance, freshness, vigor, etc., of youth: She is 60 but her optimism has kept her youthful. in an early period of existence; early in time. (of topographical features) having undergone erosion to a slight extent only. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: youthful (Thesaurus) youthen youthful offender Related Content Daily Word Quiz: ontiguous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language