blockhead n. + Add to list US //ˈbɫɑkˌhɛd// UK //blˈɒkhɛd// block·head Archaic Informal Slang SynonymsEtymology Synonyms boneheadduncedunderheadhammerheadknuckleheadloggerheadlunkheadmuttonheadnumskullshitheadOrigin 1532, block (noun) + -head.