racing
okup/jackass'>jackass know-nothing knucklehead lamebrain loggerhead [chiefly dialect] loon lump lunkhead meathead mome [archaic] moron mug [chiefly British] mutt nimrod [slang] nincompoop ninny ninnyhammer nit [chiefly British] nitwit noddy noodle numskull (or numbskull) oaf pinhead prat [British] ratbag [chiefly Australian] saphead schlub [slang] (also shlub) schnook [slang] simpleton stock stupe stupid thickhead turkey woodenhead yahoo yo-yo