treacherous (adjective) treacherous: dishonest, disloyal
Sinonime: betraying,
catchy,
deceitful,
deceptive, double-crossing, double-dealing,
duplicitous, faithless,
false, false-hearted, fly-by-night,
insidious,
misleading,
perfidious, recreant, shifty,
slick*,
slippery*, snake in the grass, traitorous, treasonable,
tricky, two-faced, two-timing, undependable, unfaithful, unloyal,
unreliable,
untrue,
untrustworthyAntonime: forthright,
honest,
loyal,
true