Synonyms of perfidious

Adjective

1. punic, perfidious, treacherous, unfaithful (vs. faithful)

usage: 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"

Definition and meaning of perfidious (Dictionary)