/ Thesaurus / D Synonyms of dumfounding Find synonyms for: Adjective1. astounding, dumbfounding, dumfounding, incredible (vs. credible), unbelievableusage: bewildering or striking dumb with wonderWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: heifer Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language