treacherynoun [ U ]
uk/ˈtretʃ.ər.i/us/ˈtretʃ.ɚ.i/formalbehaviour that deceives or is not loyal to someone who trusts you:
From his cell on board ship, the captain wrote about the treachery of his crew.
Thesaurus: synonyms and related words
Disloyalty, betrayal & treason
- adultery
- backstabber
- betray
- betrayal
- break ranks idiom
- collaborate
- deserter
- desertion
- double-cross
- faithless
- false
- fifth column
- high treason
- sell sb down the river idiom
- sellout
- stab
- stab sb in the back idiom
- traitor
- treacherous
- treason
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