Of, relating to, or having the nature of sedition:
Relating to, constituting, or involving treason:
Lacking faith; unbelieving
Not having religious faith
Find another word for treasonous. In this page you can discover 6 synonyms, antonyms, idiomatic expressions, and related words for treasonous, like: seditious, traitorous, treasonable, trust, faithless and unfaithful.