perfidiousness

And ultimately, we can’t expect that post-truth culture will somehow collapse because of its perfidiousness.

From New York Times ● May 27, 2016

Ah! dear compatriots, be not deceived; you little guess the terrible perfidiousness of that language.

From English Pharisees and French Crocodiles and Other Anglo-French Typical Characters by Max O'Rell

After this they entered into some discourse of Melanthe, and whether it would be proper for Louisa to write her an account of this affair, and the count's perfidiousness.

From The Fortunate Foundlings Being the Genuine History of Colonel M——Rs, and His Sister, Madam Du P——Y, the Issue of the Hon. Ch——Es M——Rs, Son of the Late Duke of R—— L——D. Containing Many Wonderful Accidents That Befel Them in Their Travels, and Interspersed with the Characters and Adventures of Several Persons of Condition, In the Most Polite Courts of Europe. the Whole Calculated for the Entertainment and Improvement of the Youth of Both Sexes. by Eliza Fowler Haywood

The King, according to the same document, rejected such a treacherous overture with the utmost horror, vehemently protesting against its immorality and perfidiousness.

From The Great Events by Famous Historians, Volume 09 by Rossiter Johnson

I had not been married eight months, when you suspected me of every perfidiousness, and you even told me so.

From The Works of Guy de Maupassant, Volume 2 by Guy de Maupassant