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[trey-ter-uh s] /ˈtreɪ tər əs/
having the character of a traitor; treacherous; perfidious.
characteristic of a traitor.
of the nature of treason; treasonable:
a traitorous act.
Origin of traitorous
1350-1400; Middle English treterous, traytrous < Old French traitreus; see traitor, -ous
Related forms
traitorously, adverb
traitorousness, noun
nontraitorous, adjective
nontraitorously, adverb
nontraitorousness, noun
untraitorous, adjective
untraitorously, adverb
untraitorousness, noun
1–3. disloyal, treasonous, faithless. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for traitorous
Contemporary Examples
Historical Examples
  • This clause clearly proves that many Pisans were traitorous, or disposed to treason.

  • But who has a heart so traitorous to humanity as to feed this monster?

    Select Temperance Tracts American Tract Society
  • The caress which had been so traitorous grew honest and kind.

    The Backwoodsmen Charles G. D. Roberts
  • It was Nicodemus Sedgett, or Robert's eyes did him traitorous service.

    Rhoda Fleming, Complete George Meredith
  • At such a time the soul turns from traitorous friends to an open foe with something like a feeling of confidence and attachment.

    Alexander the Great Jacob Abbott
  • I now make known to you that such future defiance will be punished as traitorous to me.

    A German Pompadour Marie Hay
  • "I ask you to give up all traitorous friendships, and return to your allegiance and duty to your King," said his father.

    Hayslope Grange Emma Leslie
Word Origin and History for traitorous

late 14c., apparently from Old French traitreus (mid-13c.), from traitor (see traitor).

Online Etymology Dictionary, © 2010 Douglas Harper
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