/ Dictionary / Index S stumbling block: Meaning and Definition of Find definitions for: stum'bling block" Pronunciation: [key] an obstacle or hindrance to progress, belief, or understanding. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. stumblebum stumer Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language