Dumbfounding First-Syllable Rhymes 31 Rhymes Found Add Dumbfounding to Favorites Definition Thesaurus One-Syllable Rhymes 1 dumb Two-Syllable Rhymes 21 dumbbell dumbbells dumber dumbest dumbfound dumbfounds dumbhead dumbly dumbness dumbstruck dumdum dumdums dumfound dumfounds dummies dummy dumper dumpers dumping dumpish dumpy Three-Syllable Rhymes 9 dumbfounded dumbfounding dumbwaiter dumbwaiters dumfounded dumfounding dumpier dumpiest dumpiness