treasonous

T1R1E1A1S1O1N1O1U1S1

adjective

Like or in the way of treason.

“His treasonous actions earned Benedict Arnold eternal scorn.”

Similar
dastardlyperfidioustraitorousbookydislealdisloyaldouble-crossingdouble-dealing
OriginProto-Indo-European *h₃édosder.? ← English treason →
UncommonScrabble 10
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Meanings

adjectivetreasonous (not comparable)
  1. not comparableLike or in the way of treason.

    His treasonous actions earned Benedict Arnold eternal scorn.

    Synonyms: dastardly, perfidious, traitorous, booky, dastardly, disleal, disloyal, double-crossing

Synonyms & antonyms

adjectiveLike or in the way of treason.

Similar
dastardlyperfidioustraitorousbookydastardlydislealdisloyaldouble-crossingdouble-dealingdouble-faceddouble-hearteddoubleheartedfaithlessfalsefalseheartfalse-heartedguiledguilefulhollow-heartedilloyal

More synonyms by meaning

adjectivehaving the character of, or characteristic of, a traitor

Similar
faithlesstraitorousunfaithfultreasonabledisloyal
Also see
faithlessseditioustraitoroustreasonableunfaithful

Synonym sets from Open English WordNet, CC BY 4.0.

Origin

  1. Englishtreason
  2. Proto-Indo-European*h₃ed-
  3. Proto-Indo-European*h₃édosder.?
  4. Englishtreasonous

From treason + -ous.

Full word history & related roots →
Cite this entry
APA

treasonous. (n.d.). In WatkinsX Dictionary. Retrieved November 2, 2026, from https://dictionary.watkinsx.com/word/treasonous

MLA

“treasonous.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/treasonous. Accessed November 2, 2026.

Chicago

WatkinsX Dictionary, s.v. “treasonous,” accessed November 2, 2026, https://dictionary.watkinsx.com/word/treasonous.

Source: treasonous on Wiktionary, CC BY-SA 4.0.