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
simple
simpleton