characterized by faithlessness or readiness to betray trust; traitorous.

deceptive, untrustworthy, or unreliable.

unstable or insecure, as footing.

dangerous; hazardous

a treacherous climb.

adjective

forthright , honest , loyal , true , harmless , untreacherous

adjective

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 , untrustworthy , alarming , chancy , difficult , dissembled , faulty , hairy * , hazardous , icy * , insecure , jeopardous , menacing , ominous , perilous , precarious , risky , shaky , slippery , ticklish , unhealthy , unsafe , unsound , unstable , wicked , disloyal , adventurous , parlous , venturesome , venturous , dangerous , dirty , dishonest , hairy , snaky , treasonous , unscrupulous , wily