/ Dictionary / Index G grueling: Meaning and Definition of Find definitions for: gru•el•ing Pronunciation: (gr'u-ling, gr'ling), [key] — adj. exhausting; very tiring; arduously severe: the grueling Boston marathon. —n. any trying or exhausting procedure or experience. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: grueling (Thesaurus) gruel Gruenberg Related Content Daily Word Quiz: cetacean Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language