" perfidies "

1: the act or fact of violating the trust or confidence of another;

  * e.g., " ... the full cost—both in compromised intelligence and in human life—of the double agent's perfidy is not yet known "

•  Synonyms : 

•  backstabbings,

•  betrayals,

•  businesses,

•  disloyalties,

•  double crosses,

•  falsities,

•  infidelities,

•  sellouts,

•  treacheries,

•  treasons

•  Antonyms : 

•  allegiances,

•  devotions,

•  fealties,

•  fidelities,

•  loyalties

1: lack of faithfulness especially to one's husband or wife;

  * e.g., " ... his wife's perfidy was a moment of uncharacteristic weakness "

•  Synonyms : 

•  disloyalty,

•  faithlessness,

•  falseness,

•  falsity,

•  inconstancy,

•  infidelity,

•  perfidiousness,

•  unfaithfulness

•  Antonyms : 

•  allegiance,

•  constancy,

•  devotedness,

•  devotion,

•  faith,

•  faithfulness,

•  fealty,

•  fidelity,

•  loyalty

2: the act or fact of violating the trust or confidence of another;

  * e.g., " ... the full cost—both in compromised intelligence and in human life—of the double agent's perfidy is not yet known "

•  Synonyms : 

•  backstabbing,

•  betrayal,

•  business,

•  disloyalty,

•  double cross,

•  faithlessness,

•  falseness,

•  falsity,

•  infidelity,

•  sellout,

•  treachery,

•  treason,

•  two-timing,

•  unfaithfulness

•  Antonyms : 

•  allegiance,

•  devotion,

•  faithfulness,

•  fealty,

•  fidelity,

•  loyalty,

•  staunchness,

•  steadfastness