perfidy Hear it!

perfidy definition

per·fidy (pʉr′fə dē)

noun pl. perfidies -·dies

the deliberate breaking of faith; betrayal of trust; treachery

Etymology: Fr perfidie < L perfidia < perfidus, faithless < per fidem (decipi), (to deceive) through faith < per (see per) + fides, faith

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