schlemiel

also
n. Slang
A habitual bungler; a dolt.

[Yiddish shlemíl, perhaps from Hebrew šəlūmî'ēl, my well-being is God, Shelumiel (a character in the Bible, Numbers 7:36) : šəlūmî, my well-being (šālôm, well-being + -î, my) + 'ēl, God.]

and schlemihl; shlemiel n. a gullible person; a loser. (From Hebrew Shelumiel via Yiddish.)  See if you can get that schlemiel to buy the Brooklyn Bridge.

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The noun has one meaning:

Meaning #1: a person who is gullible and easy to take advantage of
  Synonyms: chump, fool, gull, mark, patsy, fall guy, sucker, shlemiel, soft touch, mug

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