/ 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 Related Content Daily Word Quiz: neologism Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language