Synonyms and related words :
asshole, blockhead, blunderer, blunderhead, boob, booby, boor, botcher, bumbler, bungler, chump, clod, clodhopper, clodknocker, clot, clown, ding-a-ling, dingbat, dingdong, dolt, fumbler, galoot, gawk, goof, gowk, jerk, jerk-off, lobster, looby, lout, lubber, lug, lummox, lump, mutt, oaf, ox, palooka, prize sap, sap, saphead, sawney, schlemiel, slouch, slubberer, yokel