Meaning 1neutral · 85%
The act or behaviour of betraying someone’s trust or loyalty.
Natural examples
The king feared treachery among his closest advisers.
She never forgave his treachery.
Secret negotiations amounted to treachery against their allies.
Usage note
Treachery is usually uncountable; an act of treachery is preferred to a treachery.
Useful combinations
act of treachery — an instance of betrayal — disloyal and deceptive conduct