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 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 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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).

Online Etymology Dictionary, © 2010 Douglas Harper