1. (

• treacherous ,
• unreliable

) dangerously unstable and unpredictable; "treacherous winding roads"; "an unreliable trestle" ;

2. (

• punic ,
• perfidious ,
• treacherous

) tending 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" ;