treacherous

Synonyms: betraying catchy deceitful deceptive doublecrossing 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

Antonyms: forthright honest loyal true

Synonyms: alarming chancy deceptive difficult dissembled faulty hairy hazardous icy insecure jeopardous menacing misleading ominous perilous precarious risky shaky slippery ticklish tricky undependable unhealthy unreliable unsafe unsound unstable wicked

Antonyms: harmless untreacherous