Definition of "perfidiously" []

• In a perfidious manner. (adverb)

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• "The Baron could, by a single word perfidiously repeated, injure him very much with Alba's mother."
• "The more persuaded you are of your unique access to the rottenness, the more afraid you become of engaging with the world; and the less you engage with the world, the more perfidiously happy-faced the rest of humanity seems for continuing to engage with it."
• "There goes Oren again, perfidiously trashing the reputation of Prof. Kerr."