dis·loy·al

[dis-loi-uhl]
adjective
false to one's obligations or allegiances; not loyal; faithless; treacherous.

Origin:
1470–80; < Middle French desloial, Old French desleal, equivalent to des- dis-1 + leal loyal

dis·loy·al·ist, noun
dis·loy·al·ly, adverb


unfaithful, perfidious, traitorous, treasonable.
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
disloyal (dɪsˈlɔɪəl) [Click for IPA pronunciation guide]
 
adj
not loyal or faithful; deserting one's allegiance or duty
 
dis'loyally
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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00:10
Disloyal is always a great word to know.
So is ninnyhammer. Does it mean:
the offspring of a zebra and a donkey.
a fool or simpleton; ninny.
Etymonline
Word Origin & History

disloyal
late 15c., from O.Fr. desloial, from des- (see dis-) + loial (see loyal).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Renee was fired for her disloyal behavior and her poor judgment.
No one who participates in this conversation should be branded as disloyal or a
  traitor.
Even good publicity could make a banker uppity, disloyal and limelight-seeking.
Many viewed his action as disloyal and opportunistic.
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