schnook
noun
- person easily conned
Wiktionary
noun
Etymology: Borrowed from Yiddish שנוק (shnuk), a person easily imposed upon or cheated.
- A person who is easily taken advantage of.
“He’s just a schnook. She’s obviously using him but he keeps coming back for more abuse.”
“The Apartment. Producer-Director Billy Wilder tells of a sweet-natured schnook (brilliantly played by Jack Lemmon) who shoots up the corporate ladder.”