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Definition of perfidious:

  1. Guilty of perfidy; violating good faith or vows; false to trust or confidence reposed; teacherous; faithless; as, a perfidious friend.
  2. Involving, or characterized by, perfidy.

Synonyms:

disloyal, treacherous, traitorous, recreant, unfaithful, Punic, untrue, false-hearted, corrupt, dishonest, faithless, study at faithless, continue, false, faithless, unreliable, trust.

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