Origin: 1350–1400; Middle English treterous, traytrous <
Old French traitreus; see traitor, -ous Related formstrai·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
EXPANDun·trai·tor·ous, adjective
un·trai·tor·ous·ly, adverb
un·trai·tor·ous·ness, noun
COLLAPSESynonyms
1–3. disloyal, treasonous, faithless.