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perfidy definition: The definition of a perfidy is a deliberate betrayal. (noun) An example of a perfidy is spreading a best friend's secrets all over town....
Meaning: Tending to betray; especially having a treacherous character as attributed to the Carthaginians by the Romans. Synonyms: perfidious; punic; treacherous. Context examples: Punic faith / the perfidious Judas / the fiercest and most treacherous of foes / treacherous intrigues. Similar: unfaithful (not true to duty or obligation or promises)