as in treachery
the act or fact of violating the trust or confidence of another
reading a friend's diary without permission would have to be regarded as the ultimate act of personal treason
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Recent Examples of treason
In France in the late nineteenth century, a Jewish Army captain, Alfred Dreyfus, was put on trial on false charges of treason.
—
Nicholas Lemann, New Yorker, 21 Feb. 2026
After years of scrutiny and criticism over his ties with Epstein, his arrest was the first for a senior royal since Charles I, who was beheaded for treason in 1649.
—Alexander Smith, NBC news, 20 Feb. 2026
The last senior member of Britain’s royal family to be arrested in connection with a serious crime was King Charles I, who was beheaded for treason in 1649 following his defeat in the English Civil War.
—Rafi Schwartz, TheWeek, 20 Feb. 2026
Charles was arrested in 1647, convicted of treason, and beheaded in 1649.
—Niall Stanage, The Hill, 19 Feb. 2026
See All Example Sentences for treason
Nicholas Lemann, New Yorker, 21 Feb. 2026
After years of scrutiny and criticism over his ties with Epstein, his arrest was the first for a senior royal since Charles I, who was beheaded for treason in 1649.
—Alexander Smith, NBC news, 20 Feb. 2026
The last senior member of Britain’s royal family to be arrested in connection with a serious crime was King Charles I, who was beheaded for treason in 1649 following his defeat in the English Civil War.
—Rafi Schwartz, TheWeek, 20 Feb. 2026
Charles was arrested in 1647, convicted of treason, and beheaded in 1649.
—Niall Stanage, The Hill, 19 Feb. 2026
See All Example Sentences for treason
Recent Examples of Synonyms for treason
Noun
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After Thomas Hickey was hanged that year for mutiny, sedition and treachery, Washington warned that his fate should serve as a caution to all soldiers.—
Kim Hjelmgaard,
USA Today,
26 Feb. 2026
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With their leader detained, El Mayo’s sicarios, or hit men, declared war against supporters of Chapo’s sons in an attempt to exact vengeance for the treachery and strengthen their own position in the wider organization.—
Daniel DePetris,
Mercury News,
26 Feb. 2026
Noun
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The reality star's betrayal cost him a pretty penny in the end.—
Emlyn Travis,
Entertainment Weekly,
5 Mar. 2026
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To ventriloquize one’s parent is a bold move, and fictitious Barbara would absolutely read it as a betrayal.—
Literary Hub,
Literary Hub,
5 Mar. 2026
Cite this Entry
“Treason.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/treason. Accessed 10 Mar. 2026.
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