- violation of faith; betrayal of trust; treason.
- an act of perfidy, faithlessness, or treason.
Origin of treachery
Examples from the Web for treachery
His treachery, however, had been skillfully concealed for years.The Castration of Alan Turing, Britain’s Code-Breaking WWII Hero
November 29, 2014
Through its wrenching, eventually exhausting series of betrayals, Game of Thrones asks, “Is treachery unavoidable?”Daenerys Goes to Washington: The Modern Politics of ‘Game of Thrones’
April 8, 2014
There is a short fuse and a certain explosion at the end of this piece of treachery.Cut the Baloney on Ukraine
Leslie H. Gelb
March 9, 2014
Immediately, the hardline settlers were quick to accuse their own elected officials of all sorts of treachery.Leaving the Settlements
May 6, 2013
“[C]owardice is worse, treachery is worse, and simple selfishness is worse,” he said.The Hemingway Lesson
July 5, 2011
How could Robert have learned anything of his treachery to his father?
I should like to meet him face to face, and charge him with his treachery.
He came a little toward the girl who had accused him of treachery.Within the Law
It was not long before they had to pay a heavy penalty for their treachery and inconstancy.Stories from Thucydides
H. L. Havell
It after wards appears that the scheme of Rumi-naui was one of treachery.Apu Ollantay
- the act or an instance of wilful betrayal
- the disposition to betray
Word Origin and History for treachery
early 13c., from Old French trecherie "deceit, cheating" (12c.), from trechier "to cheat, deceive" (see trick).