/ Dictionary / Index G grum: Meaning and Definition of Find definitions for: grum Pronunciation: (grum), [key] — grum•mer, grum•mest. grim; glum; surly. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. gruiform grumble Related Content Daily Word Quiz: procrastinate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language