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

The people were arrested on suspicion of posing a threat to national security, according to authorities, and are in custody facing treason charges. — ABC News, 27 Aug. 2026

Turn on any cable news network, and the national political landscape can look like a toxic wasteland, defined by vitriol, outrage, even allegations of treason. — Jeffrey Sonnenfeld, Hartford Courant, 13 Aug. 2026

The messenger, French emigré Charles Darnay (Civil) is arrested for treason. — Etan Vlessing, HollywoodReporter, 12 Aug. 2026

In the trailer, Lucie enlists the help of Sydney when Charles is imprisoned and charged with treason after delivering her a message from Paris that alleges her father, who has been dead for nearly 20 years, is alive. — Julia Moore, PEOPLE, 12 Aug. 2026