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“depraver”
Anyone who speaks ill of or who maligns another person or others: The reporter of the local newspaper was accused of being a depraver of those who did not agree with his political viewpoints.
(Latin: crooked, crookedness; perverted, vicious, wicked; borrowed through Old French depraver or directly from Latin depravare, "to corrupt"; from de, "completely" + pravus, "crooked")