/ Dictionary / Index M mirthful: Meaning and Definition of Find definitions for: mirth•ful Pronunciation: (mûrth'ful), [key] — adj. joyous; gay; jolly: a mirthful laugh. providing mirth; amusing: a mirthful experience. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: mirthful (Thesaurus) mirth MIRV Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language