falsehearted (?.)

• Machiavellian
• ambidextrous
• artful
• calculating
• chiseling
• collusive
• covinous
• crafty
• crooked
• cunning
• deceitful
• dishonest
• disingenuous
• double
• double-dealing
• double-faced
• double-minded
• double-tongued
• doublehearted
• duplicitous
• faithless
• false
• false-principled
• finagling
• forsworn
• fraudulent
• furtive
• guileful
• indirect
• insidious
• insincere
• perfidious
• perjured
• scheming
• sharp
• shifty
• slippery
• sneaky
• surreptitious
• treacherous
• trickish
• tricky
• two-faced
• uncandid
• underhand
• underhanded
• unfrank
• unsincere
• untruthful
• wily