knucklehead knuckle guard • knuckle joint · · · Info · Definitions · Synonyms · Characters · · knucklehead · · Text Latin · · Script 11 · · Length 3 · · Syllables Definitions · · · (noun) a stupid person; these words are used to express a low opinion of someone's intelligence. Synonyms: dunce, dunderhead, numskull, blockhead, bonehead, lunkhead, hammerhead, loggerhead, muttonhead, shithead, dumbass, fuckhead. · · Noun Definition 1 Synonyms · · · dunce · · Synonym 1 dunderhead · · Synonym 2 numskull · · Synonym 3 blockhead · · Synonym 4 bonehead · · Synonym 5 lunkhead · · Synonym 6 hammerhead · · Synonym 7 loggerhead · · Synonym 8 muttonhead · · Synonym 9 shithead · · Synonym 10 dumbass · · Synonym 11 fuckhead · · Synonym 12 Characters · · a latin small letter a U+0061 c latin small letter c U+0063 d latin small letter d U+0064 e latin small letter e U+0065 h latin small letter h U+0068 k latin small letter k U+006B l latin small letter l U+006C n latin small letter n U+006E u latin small letter u U+0075