/ Dictionary / Index D dumb-dumb: Meaning and Definition of Find definitions for: dumb-dumb Pronunciation: (dum'dum"), [key] — n., adj. dum-dum. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. dumb Dora dumbfound Related Content Daily Word Quiz: reclusive Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language