treasonous
treasonous adjective: like or in the way of treason.
Adjective
treasonous (not comparable)
- Like or in the way of treason.
- His treasonous actions earned Benedict Arnold eternal scorn.
- Synonyms:
- dastardly, perfidious, traitorous, booky, disleal, disloyal, double-crossing, double-dealing, double-faced, double-hearted
Synonyms of treasonous
- dastardly
- perfidious
- traitorous
- booky
- disloyal
- double-crossing
- double-dealing
- double-faced
- double-hearted
- doublehearted
30 more synonymsFewer synonyms
Origin of treasonous
From treason + -ous.
Words formed from treasonous
Questions about treasonous
- What does treasonous mean?
- Treasonous means like or in the way of treason.
- What part of speech is treasonous?
- Treasonous is an adjective.
Words near treasonous in the dictionary
Source and license
Adapted from Wiktionary: treasonous (page history and authors). Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws reformatted the entry and added links. Wiktionary data of 2026-09-02.
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