dis·loy·al·ty

[dis-loi-uhl-tee]
noun, plural dis·loy·al·ties.
1.
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 Middle English < Middle French desloiaute, Old French desleaute, equivalent to desleal disloyal + -te -ty2


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.
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
disloyalty (dɪsˈlɔɪəltɪ) [Click for IPA pronunciation guide]
 
n , pl -ties
the condition or an instance of being unfaithful or disloyal

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

disloyalty
early 15c., from M.Fr. desloyaulte, from O.Fr. desloialteit, from desloial (see disloyal).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Herman seems disinclined to make distinctions between poor policy advice and
  disloyalty.
It was largely your guilt toward your comrades and toward the dead that held
  you back, the dread of disloyalty.
To choose foreignness is an act of disloyalty to one's native country.
Disloyalty is not shown to an employer simply because an employee contemplates
  a job change.
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