Synonyms: treacherous, perfidious, punic
Definition: tending to betray; especially having a treacherous character as attributed to the Carthaginians by the Romans
Usage: Punic faith; the perfidious Judas; the fiercest and most treacherous of foes; treacherous intrigues
Similar words: unfaithful
Definition: not true to duty or obligation or promises
Usage: an unfaithful lover