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perfidious
Adjectiveperfidious has 1 sense
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" Antonym:faithful (indirect, via unfaithful)