trai·tor·ous

[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

trai·tor·ous·ly, adverb
trai·tor·ous·ness, noun
non·trai·tor·ous, adjective
non·trai·tor·ous·ly, adverb
non·trai·tor·ous·ness, noun
un·trai·tor·ous, adjective
un·trai·tor·ous·ly, adverb
un·trai·tor·ous·ness, noun


1–3. disloyal, treasonous, faithless.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
Cite This Source Link To traitorous
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Traitorous is always a great word to know.
So is quincunx. Does it mean:
the offspring of a zebra and a donkey.
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
Collins
World English Dictionary
traitor (ˈtreɪtə) [Click for IPA pronunciation guide]
 
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
The traitorous captain hesitated for a short while after his arrest, but soon
  made a full confession.
Lawyers showered his traitorous bodyguard with rose petals.
And aside from their traitorous aspects, of what a medley of follies are such
  ideas com pounded.
Nor can there be any doubt that he was keenly aware of the gravity of his
  traitorous actions.
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