(n.) Violation of allegiance or of faith and confidence; treasonable or perfidious conduct; perfidy; treason\.

Machiavellianism ambidexterity artifice bad faith cunning danger deceitfulness desultoriness dirty pool dirty trick dirty work dishonesty disloyalty 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 treason two-facedness unauthenticity unauthoritativeness undependability unfaithworthiness unreliability unsolidity unsoundness unsteadfastness unsteadiness unsubstantiality unsureness untrustworthiness wile