Perfidiousness
Full definition of perfidiousness
Noun
perfidiousness
(usually uncountable; plural perfidiousnesses)- (rare) Unfaithfulness; deceitfulness; perfidy.
- 1781, Samuel Johnson, "Addison" in Lives of the Poets:Not only Cato is vanquished by Caesar, but the treachery and perfidiousness of Syphax prevail over the honest simplicity and the credulity of Juba.