Synonyms and related words :
arab, blockhead, blunderer, boob, bungler, butterfingers, clumsy, dimwit, dolt, dope, dub, dumbbell, foozler, foul-up, fumble-fist, goof, goofball, goofer, hawker, hick, higgler, huckster, idiot, ignoramus, incompetent, lummox, lump, monger, muff, muffer, numskull, oaf, ox, roadman, rube, slob, stumblebum, stumblebunny, vendor