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

Alfred Dreyfus, whose wrongful 19th century treason conviction exposed deeply rooted anti-Jewish bias in France. — Masha MacPherson, Los Angeles Times, 12 July 2026

What constitutes treason is emerging as an early theme of House of the Dragon’s third season. — Amanda Whiting, Vulture, 29 June 2026

Elizabeth Graeme later found herself alone as her husband fled treason charges and returned to Europe. — Kim Hudson, CBS News, 25 June 2026

Any dissent now risks being recast as treason. — semafor.com, 25 June 2026