" disloyalty "

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

  * e.g., " ... she was greatly pained by her husband's disloyalty "

•  Synonyms : 

•  faithlessness,

•  falseness,

•  falsity,

•  inconstancy,

•  infidelity,

•  perfidiousness,

•  perfidy,

•  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., " ... His disloyalty to the company led to his dismissal. "

•  Synonyms : 

•  backstabbing,

•  betrayal,

•  business,

•  double cross,

•  faithlessness,

•  falseness,

•  falsity,

•  infidelity,

•  perfidy,

•  sellout,

•  treachery,

•  treason,

•  two-timing,

•  unfaithfulness

•  Antonyms : 

•  allegiance,

•  devotion,

•  faithfulness,

•  fealty,

•  fidelity,

•  loyalty,

•  staunchness,

•  steadfastness