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  1. having the character of a traitor; treacherous; perfidious.
  2. characteristic of a traitor.
  3. of the nature of treason; treasonable: a traitorous act.
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Origin of traitorous

1350–1400; Middle English treterous, traytrous < Old French traitreus; see traitor, -ous
Related formstrai·tor·ous·ly, adverbtrai·tor·ous·ness, nounnon·trai·tor·ous, adjectivenon·trai·tor·ous·ly, adverbnon·trai·tor·ous·ness, nounun·trai·tor·ous, adjectiveun·trai·tor·ous·ly, adverbun·trai·tor·ous·ness, noun

Synonyms for traitorous

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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words for traitorous

apostate, faithless, perfidious, recreant, subversive, treacherous, treasonous, two-faced, two-timing, unfaithful, untrue, wormlike, treasonable, undutiful, unpatriotic

Examples from the Web for traitorous

Contemporary Examples of traitorous

Historical Examples of traitorous

Word Origin and History for traitorous


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

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Online Etymology Dictionary, © 2010 Douglas Harper