Synonyms of treacherous

1 Syllable

slyer, slyest, sliest, sly, slick, slier

2 Syllables

disloyal, corrupt, devious, faithless, false, untrue, tricky, truthless, betraying, unloyal, parlous, sneaking, yellow, shifty, catchy, toucher, shiftier, witted, recreant, riskier, risky, lying, shiftiest

3 Syllables

deceitful, insidious, perilous, dishonest, misleading, blackguardly, opprobious, yellowest, designing, underhand, moonlighting, jeopardous, yellower, liverish, perjurious, dangerous, perfidious, slippery, fraudulent, traitorous, vipery, uncomplying, lubricious, two-faced, two-timing, foresworn, dissentious, scoundrelly, treasonous, fly-by-night, hardnosed, unsafe, unfaithful, nefarious

4 Syllables

untrustworthy, unreliable, rabble-rousing, unpatriotic, treasonable, deceptive, dirty-dealing, false-hearted, incendiaries, double-crossing, dangersome, undutiful, pigeonhearted, incendiary, double-dealing, duplicitous, mythomaniac, unbalanced, demagogic, unconverted, profiteering

5 Syllables

dishonorable, adulterine, undependable

6 Syllables

insubordinate, prevaricatory