the quality of being disloyal; lack of loyalty; unfaithfulness.
2.
violation of allegiance or duty, as to a government.
3.
a disloyal act.
Origin: 1400–50; late ME < MF desloiaute, OF desleaute, equiv. to deslealdisloyal+ -te-ty2
Synonyms: 1.faithlessness, subversion. Disloyalty,perfidy,treachery,treason imply betrayal of trust. Disloyalty applies to any violation of loyalty, whether to a person, a cause, or one's country, and whether in thought or in deeds: to suspect disloyalty in a friend. Perfidy implies deliberate breaking of faith or of one's pledges and promises, on which others are relying: It is an act of perfidy to cheat innocent people. Treachery implies being secretly traitorous but seeming friendly and loyal: In treachery deceit is added to disloyalty. Treason is performing overt acts to help the enemies of one's country or government: Acting to aid a hostile power is treason.
[dis-loi-uh
l-tee] 