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Definition of perfidy : The act of violating faith or allegiance; violation of a promise or vow, or of trust reposed; faithlessness; treachery.

Synonyms:

falseness, treason, lese majesty, falsity, infidelity, continue, disloyalty, treachery, trust, subversiveness, betrayal, faithlessness, treacherousness, dishonesty, false-heartedness, unfaithfulness, traitorousness, high treason, perfidiousness

Usage examples:

• And only once again did he doubt; and he longed to throttle the man who brought into light what appeared to be the most damnable evidence of Thomas' perfidy. - "The Voice in the Fog", Harold MacGrath.
• His execution remains an enduring monument not only of Philip's cruelty and perfidy but of his dullness. - "The Rise of the Dutch Republic, Volume II.(of III) 1566-74", John Lothrop Motley Last Updated: January 25, 2009.
• Certainly Winona never suspected that a mere boy had been desolated by woman's perfidy and Lyman's mad abandonment of all that people of the better sort most prize. - "The Wrong Twin", Harry Leon Wilson.