Synonyms and related words :
asshole, blockhead, boob, booby, chump, cur, dimwit, ding-a-ling, dingbat, dingdong, dolt, dope, dumbbell, galoot, goof, idiot, ignoramus, jerk, jerk-off, klutz, lurcher, mongrel, numskull, pariah dog, prize sap, sap, saphead, sawney, schlemiel