easy mark
Noun
Meaning
a defenseless victim
Source: WordNetSynonyms
sitting duck
pigeon
gopher
patsy
chump
prey
lamb
scapegoat
gudgeon
stooge
victim
sucker
fall guy
ingenue
pushover
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Antonyms
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Examples
It's joyful to give. But for people who want to take advantage of you, you're kind of an easy mark.
You won't find Earth people, quite the easy mark you imagine.
She sure seems an easy mark, doesn’t she?
The North may believe that Trump is an easy mark for the latest iteration of this approach.