Trea·son·a·ble a. Pertaining to treason; consisting of treason; involving the crime of treason, or partaking of its guilt.
Most men's heads had been intoxicated with imaginations of plots and treasonable practices. --Clarendon.
Syn: -- Treacherous; traitorous; perfidious; insidious.
--Trea*son*a*ble*ness, n. -- Trea*son*a*bly, adv.
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