In order to free his mind from this indistinctness and duplicity of impression, which vexed it with a strange disquietude, he recalled and more thoroughly defined the plans which Hester and himself had sketched for their departure.
There are no more uses of "duplicity" in the book.
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I trust her. Duplicity isn’t in her nature or her tool kit.
I was stunned by her duplicity. I really thought she loved me.