This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

n. Deliberate breach of faith; calculated violation of trust; treachery: "the fink, whose perfidy was equaled only by his gall” ( Gilbert Millstein).

n. The act or an instance of treachery.

n. A state or act of violating faith or allegiance; violation of a promise or vow, or of trust reposed; faithlessness; treachery.

n. Specifically, in warfare, an illegitimate act of deception, such as using symbols like the Red Cross or white flag to gain proximity to an enemy for purposes of attack.

n. A state or act of deceit.

n. The act of violating faith or allegiance; violation of a promise or vow, or of trust reposed; faithlessness; treachery.

n. Breach of faith or trust; hase treachery; faithlessness.

n. Synonyms See perfidious.

n. an act of deliberate betrayal

n. betrayal of a trust

"But much as she loved England she was very loud in denouncing what she called the perfidy of the mother to the brightest of her children."

perfidiously    perfidious   

faithlessness    treachery    perfidiousness   

ingratitude    dishonesty    treachery    meanness    deceit    faithlessness    depravity    rapacity    falsehood    disloyalty