Perfidy

Perfidy‏‎

the state of being deceitful and untrustworthy.

"it was an example of his perfidy"

synonyms: treachery, duplicity, deceit, perfidiousness, deceitfulness, disloyalty, infidelity, faithlessness, unfaithfulness, betrayal, treason, falseness, falsity, double-dealing, dishonesty, two-facedness, untrustworthiness, breach of trust;