Breadcrumb Home > Dictionary > Index G grumpy: Meaning and Definition of Find definitions for: grump•y Pronunciation: (grum'pē), [key] — grump•i•er, grump•i•est. surly or ill-tempered; discontentedly or sullenly irritable; grouchy. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: grumpy (Thesaurus) grumphie Grundy TrendingHere are the facts and trivia that people are buzzing about. Jewish Holidays, 2010-2030 (A.M. 5770-5791) Western Christian Holidays, 2010-2030 12 Steps to a New Year New Year's Resolution to Slim Down? Martin Luther King Speeches Books of the Bible: Old Testament Books in Order ✖ Related Content Daily Word Quiz: avatar Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language