treasonable

[tree-zuh-nuh-buhl]

adjective

1. of the nature of treason.

2. involving treason; traitorous.

Other Word Forms

• treasonably adverb
• nontreasonable adjective
• nontreasonableness noun
• nontreasonably adverb
• untreasonable adjective

Word History and Origins

Origin of treasonable¹

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

Example Sentences

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

Read more on The Wall Street Journal

Amid this crackdown, army chief Christopher Musa warned that it is a "treasonable offence" to fly the flags of foreign countries.

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“To me, those acts are treasonable,” Solensten said of the Bidens.

Read more on Washington Times

All five have been charged with being suspected members of a terrorist group and planning “highly treasonable” acts against the government, it said.

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Randolphs unfortunate utterances were not truly treasonable, as he spent the remainder of his life trying vainly and in his foggy style to explain.

Read more on Literature