Adjective : a perfidious lover.    From Dictionary.com. 

BETTY: Oh, madam, such a piece of treachery, such perfidiousness have I discovered.    From Wordnik.com.  [The Beau Defeated: or, The Lucky Younger Brother] Reference

This last paragraph is partly made up in homage to the Lib Dems' persistent perfidiousness.    From Wordnik.com.  [Yasmin Zalzala Asks: About Lib Dem Perfidy] Reference

Reagan harped on the perfidiousness of big government every chance he got, no matter the specific occasion.    From Wordnik.com.  [Matthew Yglesias » The Filibuster Was Never a Good Idea] Reference

Their perfidiousness too well deserves such a penance; and, in short, after having told me where I might hear of her, she disappeared.    From Wordnik.com.  [The Arabian Nights Entertainments - Volume 01] Reference

It will lend you tens of millions of dollars, furnished by foreign taxpayers, so that you can offer investors insurance against your own perfidiousness.    From Wordnik.com.  [World Bank Props Up Despots With New 'Corruption' Loans] Reference

The mismanagement, secrecy and outright graft of the last administration amount to levels of perfidiousness that are tough to match in any administration.    From Wordnik.com.  [Why Are The Ammo Shelves Empty? What, Exactly, Are People Afraid Of?] Reference

These inexorable words, combined with her look of pity and reproach -- a look that seemed almost amorous on her fair face -- gave him an impression of immense perfidiousness.    From Wordnik.com.  [Sacrifice] Reference

Egyptian perfidiousness has reached sickening proportions.    From Wordnik.com.  [WHAT REALLY HAPPENED] Reference

Never was there such an instance of folly, ingratitude, and perfidiousness.    From Wordnik.com.  [Commentary on the Whole Bible Volume II (Joshua to Esther)] Reference

Penruddock's death caused by the perfidiousness of U.C. a colonel of the army, i.    From Wordnik.com.  [Sermons Preached Upon Several Occasions. Vol. IV.] Reference

From the perfidiousness of his wife and her father, he took occasion to burn their corn, ver.    From Wordnik.com.  [Commentary on the Whole Bible Volume II (Joshua to Esther)] Reference

Wherein our men are guilty of the most horrid cowardice and perfidiousness, as he says and tells it, that ever Englishmen were.    From Wordnik.com.  [Diary of Samuel Pepys — Complete] Reference

This piece of intelligence, which had been just received, put me in a violent passion: I accused the Emperor of perfidiousness.    From Wordnik.com.  [Memoirs of the Private Life, Return, and Reign of Napoleon in 1815, Vol. I] Reference

She once went so far as to say, that it was not superior discernment, which enabled her to suspect the perfidiousness of Walter.    From Wordnik.com.  [The Loyalists, Vol. 1-3 An Historical Novel] Reference

The senora coquettishly bewailed, in rising and falling inflections, his long absence, his infidelity and general perfidiousness.    From Wordnik.com.  [From Sand Hill to Pine] Reference

Their respective souls, wounded and hurt by the perfidiousness and injustice of the world, felt themselves attracted to each other.    From Wordnik.com.  [Lord Byron jugé par les témoins de sa vie. English] Reference

Cato is vanquished by Caesar, but the treachery and perfidiousness of Syphax prevail over the honest simplicity and the credulity of.    From Wordnik.com.  [Johnson's Lives of the Poets — Volume 1] Reference

For should a brother prevaricate and prove false, nature itself would seem to fly in his face, and upbraid his unhuman perfidiousness.    From Wordnik.com.  [Sermons Preached Upon Several Occasions. Vol. VII.] Reference

Now, as soon as the inhabitants of that city understood the perfidiousness of the people of Tiberias, they were greatly provoked at them.    From Wordnik.com.  [The Life of Flavius Josephus] Reference

Filled with regret at having disdained so many charms, and frequently tired of finding too often as much perfidiousness in priestesses of.    From Wordnik.com.  [The Physiology of Marriage, Part 3] Reference

Custine was accused of harshness, of unskilfulness, perfidiousness; accused of many things: found guilty, we may say, of one thing, unsuccessfulness.    From Wordnik.com.  [The French Revolution] Reference

Let not the malice of the Devil, neither the traitorousness and perfidiousness of his own evil heart, cause him to fall short of Thy heavenly calling.    From Wordnik.com.  [Robin Tremayne A Story of the Marian Persecution] Reference

The King, according to the same document, rejected such a treacherous overture with the utmost horror, vehemently protesting against its immorality and perfidiousness.    From Wordnik.com.  [The Great Events by Famous Historians, Volume 09] Reference

It appears that these days Albion doesn’t even have the courage to admit to its perfidiousness.    From Wordnik.com.  [Even perfidy is now gutless in Albion] Reference

"As I have told you before," said Jeff Peters, "I never had much confidence in the perfidiousness of woman.    From Wordnik.com.  [The Gentle Grafter] Reference

He was epic in his perfidiousness.    From Wordnik.com.  [Dov Seidman: Why Madoff Is Not a Symbol of Our Times] Reference

Their perfidiousness too well deserves such a penance. ".    From Wordnik.com.  [The Arabian Nights Entertainments - Complete] Reference

Though 'tis perfidiousness and shame.    From Wordnik.com.  [Hudibras] Reference

A composition of perfidiousness and avarice.    From Wordnik.com.  [The Prose Works of Jonathan Swift, D.D. — Volume 10 Historical Writings] Reference

(3) Your sins have more perfidiousness in them than other men's, by how much the more you have engaged yourselves against them.    From Wordnik.com.  [The Reformed Pastor] Reference