Synonyms of perfidious

1 Syllable

slick

2 Syllables

disloyal, toucher, untrue, recreant, corrupt, truthless, betraying, lying, unloyal, shifty, faithless, false

3 Syllables

traitorous, deceitful, vipery, treacherous, dishonest, two-faced, misleading, two-timing, foresworn, liverish, insidious, perjurious, phoniness, treasonous, scoundrelly, hardnosed, unfaithful, moonlighting, mendacious

4 Syllables

untrustworthy, unscrupulous, unreliable, double-dealing, falsehearted, deceptive, unpatriotic, insincere, mythomaniac, undutiful, false-hearted, pigeonhearted, unconverted, treasonable, unconscientious, double-crossing, profiteering

5 Syllables

undependable, exploitative, adulterine