Treachery

n.

1.

Violation of allegiance or of faith and confidence; treasonable or perfidious conduct; perfidy; treason. Be ware, ye lords, of their treachery. - Chaucer. In the council chamber at Edinburgh, he had contracted a deep taint of treachery and corruption. - Macaulay.

Noun	1.	treachery - betrayal of a trust Synonyms: perfidiousness, perfidy
	2.	treachery - an act of deliberate betrayal Synonyms: betrayal, perfidy, treason

Machiavellianism, ambidexterity, artifice, bad faith, cunning, danger, deceitfulness, desultoriness, dirty pool, dirty trick, dirty work, dishonesty, double cross, double-dealing, doubleness, doubleness of heart, duplicity, faithlessness, falseheartedness, falseness, foul play, hazard, improbity, infirmity, insecurity, insolidity, instability, insubstantiality, low cunning, perfidiousness, perfidy, peril, perilousness, precariousness, risk, riskiness, sellout, shakiness, shiftiness, shiftingness, slipperiness, speculativeness, ticklishness, treacherousness, two-facedness, unauthenticity, unauthoritativeness, undependability, unfaithworthiness, unreliability, unsolidity, unsoundness, unsteadfastness, unsteadiness, unsubstantiality, unsureness, untrustworthiness, wile