List of perfidious synonyms and perfidious related words.
Machiavellian, alienated, ambidextrous, artful, corrupt, crafty, crooked, cunning, deceitful, disaffected, dishonest, disloyal, double, double-dealing, double-faced, double-minded, double-tongued, doublehearted, duplicitous, estranged, faithless, false, false-principled, falsehearted, hypocritical, insidious, mercenary, recreant, shifty, slippery, traitorous, treacherous, treasonable, treasonous, tricky, two-faced, unfaithful, unloyal, untrue, venal