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Thesaurus: perfidious

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

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Definitions

  1. a. Guilty of perfidy; violating good faith or vows; false to trust or confidence reposed; teacherous; faithless; as, a perfidious friend.
  2. a. Involving, or characterized by, perfidy.
  3. adj. tending to betray; especially having a treacherous character as attributed to the Carthaginians by the Romans
  4. 1. Guilty of perfidy; violating good faith or vows; false to trust or confidence reposed; teacherous; faithless; as, a perfidious friend. Shak. 2. Involving, or characterized by, perfidy. "Involved in this perfidious fraud." Milton.
  5. j:100 s tending to betray; especially having a treacherous character as attributed to the Carthaginians by the Romans