Synonyms for dumb Found 8 synonyms across 3 meanings for “dumb”. slow to learn or understand (adj) densedimdullobtuseslow temporarily incapable of speaking (adj) speechless unable to speak because of hereditary deafness (adj) mutesilent Explore Related Words Rhymes with dumbSynonyms for denseSynonyms for dimSynonyms for dullSynonyms for obtuseSynonyms for slow Synonym Finder | Rhyme Finder | Poetry Editor