- Carthaginian, Punic - of or relating to or characteristic of ancient Carthage or its people or their language; "the Punic Wars"; "Carthaginian peace"
- 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)