Synonyms and related words :
asshole, boob, booby, chump, ding-a-ling, dingbat, dingdong, dupe, fall guy, galoot, goof, gull, hard-luck guy, hardcase, jerk, jerk-off, klutz, loser, mark, mutt, pigeon, poor unfortunate, prize sap, sad sack, sap, saphead, sawney, schlimazel, sucker, sure loser, unfortunate, victim