Synonyms for dumbass Found 12 synonyms across 1 meaning for “dumbass”. a stupid person (noun) duncedunderheadnumskullblockheadboneheadlunkheadhammerheadknuckleheadloggerheadmuttonheadshitheadfuckhead Explore Related Words Rhymes with dumbassSynonyms for dunceSynonyms for dunderheadSynonyms for numskullSynonyms for blockheadSynonyms for bonehead Synonym Finder | Rhyme Finder | Poetry Editor