/ Thesaurus / M Synonyms of mirthfulness Find synonyms for: Noun1. hilarity, mirth, mirthfulness, glee, gleefulness, gaiety, merrimentusage: great merrimentWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: copious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language