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traitorous

[trey-ter-uh s]
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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.
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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

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1–3. disloyal, treasonous, faithless.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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Word Origin and History for traitorous

adj.

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

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Online Etymology Dictionary, © 2010 Douglas Harper