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Synonyms

treasonable

American  
[tree-zuh-nuh-buhl] / ˈtri zə nə bəl /

adjective

  1. of the nature of treason.

  2. involving treason; traitorous.


Other Word Forms

Etymology

Origin of treasonable

First recorded in 1325–75, treasonable is from the Middle English word tresonabill. See treason, able

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

See Examples For:

Stripping royal titles was something reserved for those who committed near treasonable offenses or no longer considered part of the extended royal clan.

From The Wall Street Journal Oct. 31, 2025

By February 1864, Davis despaired: "Public meetings of treasonable character, in the name of state sovereignty, are being held."

From Salon Mar. 22, 2020

The British government feared a repeat of the 1916 Easter Rising and arrested most of the Sinn Féin leadership charging them with entering into treasonable communication with the German enemy.

From BBC Jul. 18, 2018

There was nothing unusual, let alone treasonable, in this.

From Washington Post Mar. 10, 2017

The Quaker petitions were therefore not treasonable or out of order.

From "Founding Brothers: The Revolutionary Generation" by Joseph J. Ellis

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