Synonyms of treason

treason

noun

ˈtrē-zᵊn 

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

Synonyms & Similar Words

• treachery
• betrayal
• disloyalty
• deception
• perfidy
• infidelity
• deceit
• faithlessness
• lying
• backstabbing
• sellout
• abandonment
• unfaithfulness
• desertion
• falseness
• double cross
• falsity
• business
• two-timing
• duplicity
• double-dealing
• fraud
• informing
• trickery
• guile
• two-facedness
• snitching
• talebearing

Antonyms & Near Antonyms

• loyalty
• allegiance
• fidelity
• devotion
• fealty
• faithfulness
• steadfastness
• reliability
• defense
• staunchness
• protection
• trustworthiness
• dependability
• shield
• safeguard

Example Sentences

Recent Examples of treason

Mexico has not successfully brought to trial a charge of treason in decades despite a recent attempt. — ABC News, 25 Oct. 2026

Putin publicly called the mutiny treason, then appeared to forgive him. — Jeffrey Sonnenfeld, Time, 22 Oct. 2026

When a pair of Israeli filmmakers released a documentary last month about civilian deaths in Gaza, party leaders across the spectrum, including Eisenkot, accused them of treason. — Arkansas Online, 8 Oct. 2026

In 1990, senior West German counterintelligence official Klaus Kuron was ​exposed as a Stasi spy and later convicted of treason. — Reuters, NBC news, 7 Oct. 2026