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Definition of treasonous : Treasonable.

Synonyms:

unfaithful, faithless, treasonable, trust

disobeying, wayward, anarchistic, disloyal, ungovernable, mischievous, out of control, factious, traitorous, intractable, treacherous, disobedient, mutinous, disregardful, contrary, rebellious, nonconformist, seditious, subversive, undisciplined, recalcitrant, insubordinate, unmanageable, defiant, misbehaving, unruly

Usage examples:

• " Master Noel had behaved in a traitorous manner, and so by law he was ejected as a papist and a dealer in treasonous things. - "The Coming of the King", James Hocking.
• She sat upon many offenders as a judge, and it is handed down that she executed divers persons for treasonous designs and plotting against her estate. - "Bygone Cumberland and Westmorland", Daniel Scott.
• I have just discovered that there exists a treasonous plot against your life. - "Ministry of Disturbance", Henry Beam Piper.