Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of treasonable is as below...

Treasonous :: Treasonous (a.) Treasonable.

Treachery :: Treachery (n.) Violation of allegiance or of faith and confidence; treasonable or perfidious conduct; perfidy; treason.

Treasonable :: Treasonable (a.) Pertaining to treason; consisting of treason; involving the crime of treason, or partaking of its guilt..

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