perfidy

perfidy n

Fr. < L. perfid-us < per-, away entirely, to destruction + fid-─ôs, faith.

  1. Treachery; deceit; betrayal; falseness; disloyalty; deception; duplicity; pretense; feigning.
  2. Violation of trust; breach of promise.
  3. Doubt; lack of trust; loss of faith.
  4. Mirage; illusion.