traitorous

[trey-ter-uhs]
adjective
1.
having the character of a traitor; treacherous; perfidious.
2.
characteristic of a traitor.
3.
of the nature of treason; treasonable: a traitorous act.

Origin:
1350–1400; Middle English treterous, traytrous < Old French traitreus; see traitor, -ous

traitorously, adverb
traitorousness, noun
nontraitorous, adjective
nontraitorously, adverb
nontraitorousness, noun
untraitorous, adjective
untraitorously, adverb
untraitorousness, noun


1–3. disloyal, treasonous, faithless.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
traitor (ˈtreɪtə)
 
n
a person who is guilty of treason or treachery, in betraying friends, country, a cause or trust, etc
 
[C13: from Old French traitour, from Latin trāditortraditor]
 
'traitorous
 
adj
 
'traitorously
 
adv
 
'traitorship
 
n
 
'traitress
 
fem n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
Parade was tarred with a traitorous, dreyfusard brush, and consigned to
  oblivion.
Lawyers showered his traitorous bodyguard with rose petals.
Some traitorous generals may lie about whether they will support a particular
  plan and what other generals told them.
Nor can there be any doubt that he was keenly aware of the gravity of his
  traitorous actions.
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