He wondered how his father, whom he knew for a shrewd suspicious man, could be duped by the servile manners of the porter; and the lively southern speech which had entertained him all the morning now irritated his ears.
…never to be free from those pains; ever to have the conscience upbraid one, the memory enrage, the mind filled with darkness and despair, never to escape; ever to curse and revile the foul demons who gloat fiendishly over the misery of their dupes, never to behold the shining raiment of the blessed spirits; ever to cry out of the abyss of fire to God for an instant, a single instant, of respite from such awful agony, never to receive, even for an instant, God’s pardon; ever to suffer,…
There are no more uses of "dupe" in the book.
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The immigrant was duped because he trusted everyone
She is innocent. She was duped like the rest of us.