Open English Wordnet
Adjectives
(s)treacherous, unreliabledangerously unstable and unpredictable“treacherous winding roads”, “an unreliable trestle”
(s)punic, perfidious, treacheroustending to betray; especially having a treacherous character as attributed to the Carthaginians by the Romans“Punic faith”, “the perfidious Judas”, “the fiercest and most treacherous of foes”, “treacherous intrigues”