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 ?
Desdemona's blood has behaved treasonously, usurping the governing power of the will.
Even though Privy Councillors currently and treasonously serve two sovereigns, commissioners cannot believably serve these two conflicting masters.
The right-wing (exemplified by the such criminals as the malodorous and corrupt Mitch McConnell) has treasonously sabotaged the Obama administration from the minute Obama took the oath.