Perfidiousness

noun

Definitions

Noun
  1. 1
    Unfaithfulness; deceitfulness; perfidy. rare, uncountable, usually

    "Not only Cato is vanquished by Caesar, but the treachery and perfidiousness of Syphax prevail over the honest simplicity and the credulity of Juba."

  2. 2
    betrayal of a trust wordnet

Etymology

From perfidious + -ness.

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