Something false; esp., a lie
Lack of fidelity or loyalty.
(Law) 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.
Find another word for perfidiousness. In this page you can discover 13 synonyms, antonyms, idiomatic expressions, and related words for perfidiousness, like: disloyalty, faithlessness, false-heartedness, falseness, falsity, infidelity, perfidy, traitorousness, treacherousness, treachery and unfaithfulness.