treasonous

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trea·son·ous

 (trē′zə-nəs)
adj.
Treasonable.

trea′son·ous·ly adv.

trea•son•ous

(ˈtri zə nəs)

adj.
treasonable.
[1585–95]
trea′son•ous•ly, adv.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adj.1.treasonous - having the character of, or characteristic of, a traitor; "the faithless Benedict Arnold"; "a lying traitorous insurrectionist"
disloyal - deserting your allegiance or duty to leader or cause or principle; "disloyal aides revealed his indiscretions to the papers"

treasonous

adjective
Involving or constituting treason:
References in periodicals archive ?
The Harry Roques of this world explain that his cursing is a way of identifying with the 'common people,' who feel betrayed by those who speak 'decently' but act treasonously.
Had the Supreme Court not read these constitutional provisions into Section 203 of the Elections Act of 2017, some of the legal absurdities that could possibly arise would be the head of a political party being a tax evader, a convicted criminal or even a person who had treasonously 'worked against the integrity of the country'.
Were the Americans acting treasonously, in ways that would compel British decision-makers to act as they did?
13) Less peacefully, violent overthrow of church government and the magistrates who supported it had a dangerous precedent in Scotland: after James VI had proclaimed against the Disciplinarians, James was treasonously restrained in a noblemans house in Rutheven.
Learning of a planned attack on the Noor, whom she views as people with a right to live, Wen treasonously journeys one hundred miles to warn them; she treats the wounded when carnage occurs.