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- Could they be other than the insidious whispers of the bad angel, who would fain have persuaded the struggling woman, as yet only half his victim, that the outward guise of purity was but a lie, and that, if truth were everywhere to be shown, a scarlet letter would blaze forth on many a bosom besides Hester Prynne's?Chapter 5 -- Hester at her Needle (87% in)
There are no more uses of "insidious" in The Scarlet Letter.
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