Synonyms for Dupe:

n.

sitting duck, prey, sitting target. wise, pigeon, entrap, mark, gudgeon, string along, lamb, fall guy, mug, rip off, pushover, sap. pawn, instrument, over, tool, stooge. take for a ride, honest, bamboozle, double cross, bluff, play false, cozen, beguile, four flush, put something over on, humbug, lead astray. dupe (noun)
take in, put one over, April Fool, laughingstock, fool, put on, gull, befool, put one across, COD, slang, victim.
fall guy (noun)
sitting duck, patsy.
flatterer (noun)
sycophant, boot-licker, fawner, groveler, puppet, toady, flatterer, jackal, back-scratcher, lackey, brown-nose.
fool (noun)
victimize, laughingstock, study at cheat.
innocent (noun)
lamb.
laughingstock (noun)
fair game, monkey, butt, patsy, game, buffoon.
person (noun)
victim.
person who is fooled (noun)
patsy, mark, pushover, victim, sitting duck, pigeon, butt, sap, fool.
stupid person (noun)
sap.
tool (noun)
jackal.

v.

communication (verb)
put one across, gull, slang, COD, take in, put one over, befool, put on, fool.
dupe (verb)
trick, hoodwink.

Other synonyms:

pawn, bamboozle, double cross, sitting duck, gudgeon, sitting target, stooge, cozen, entrap, four flush. prey, fall guy, pushover, bluff, rip off, string along, tool, pigeon. instrument, beguile, lamb. sap. mug. mark. cheat
victimize.
deceive
hoodwink, cozen.
fool
fool, beguile.
take-in
take in.
Other relevant words:
mug, instrument, four flush, sap, lamb, bamboozle, slang, pigeon, befool, rip off, play false, lead astray, double cross, put on, gudgeon, mark, gull, cozen, prey, COD, fall guy, pawn, put one across, take for a ride, humbug, sitting duck, string along, put something over on, victimize, bluff, beguile, pushover, tool, stooge, put one over.

Usage examples for dupe

  1. " The worthy Ismail," said M. de Bonneval to me, as we were leaving the house late in the evening, " has been to- day the dupe of his vanity, and I have no doubt that he is sorry already for what he has done. – The Memoires of Casanova, Complete The Rare Unabridged London Edition Of 1894, plus An Unpublished Chapter of History, By Arthur Symons by Jacques Casanova de Seingalt
  2. This was distinctly a good point in his character; no woman who gave her favours in exchange for presents received could hope to dupe him. – The Memoires of Casanova, Complete The Rare Unabridged London Edition Of 1894, plus An Unpublished Chapter of History, By Arthur Symons by Jacques Casanova de Seingalt
  3. The Rover did not answer; but his companion saw, by the meaning smile which played about his lip, that he had been the dupe of an audacious and completely successful masquerade. – The Red Rover by James Fenimore Cooper