treasonous

[ tree-zuh-nuh s ]

/ ˈtri zə nəs /

treasonable.

Origin of treasonous

First recorded in 1585–95; treason + -ous

trea·son·ous·ly, adverb

A special military tribunal had found him guilty of treasonous activities and other crimes.

North Korean Blood Feud is ‘Richard III’ with Nukes |Gordon G. Chang |December 13, 2013 |DAILY BEAST
It goes on to say that a court needs two witnesses to the treasonous act.

‘A Ghastly Waste of Time?’ Considering the Constitution |Seth Lipsky |January 15, 2013 |DAILY BEAST
Some of the same folks who called BDS treasonous see ODS as part of a patriotic resistance.

The Obama Haters Book Club: The Canon Swells |John Avlon |October 26, 2012 |DAILY BEAST
For Perry to say we can't control the Mexican border, he declared, is "pretty much a treasonous comment."

Romney Puts Perry on Defensive |Howard Kurtz |September 13, 2011 |DAILY BEAST

People who study the right have worried for months about the consequences of paranoid beliefs about treasonous government plots.

The Cult Web Film that Inspired Loughner |Michelle Goldberg |January 13, 2011 |DAILY BEAST
A treasonous tempest rises, and you stand A god indifferent when you should bethink Yourself most mortal.

The Mortal Gods and Other Plays |Olive Tilford Dargan
But he has no right to involve you in these treasonous tricks of his.

Angelot |Eleanor Price
It secured me his confidence—while strengthening his treasonous intention.

The Bandolero |Mayne Reid
It is not possible; it would not be wise; it would be treasonous to the General Woo-san-Kwei.

The War Tiger |Wiliam Dalton
Hadst thou been concerned in treasonous undertakings the matter would be plain.

In Doublet and Hose |Lucy Foster Madison