Noun
Violation of allegiance or of faith and confidence; treasonable or perfidious conduct; perfidy; treason.
Source: Webster's dictionaryDestiny is a good thing to accept when it's going your way. When it isn't, don't call it destiny; call it injustice, treachery or simple bad luck. Joseph Heller
There is no act of treachery or meanness of which a political party is not capable; for in politics there is no honour. Benjamin Disraeli
We have severely underestimated the Russians, the extent of the country and the treachery of the climate. This is the revenge of reality. Heinz Guderian
The act of treachery is liked, but not he that does it. Spanish Proverb
Anger is the mother of treachery. Welsh Proverb
No one can guard against treachery. German Proverb