/ Dictionary / Index G grump: Meaning and Definition of Find definitions for: grump Pronunciation: (grump), [key] — n. a person given to constant complaining. a depressed or sulky mood. —v.i. to complain or sulk. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: grump (Thesaurus) grumous grumphie 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