Found 2 items, similar to perfidiousness.
English → English (WordNet) Definition: perfidiousness perfidiousness n : betrayal of a trust [syn: perfidy, treachery]
English → English (gcide) Definition: Perfidiousness Perfidiousness \Per*fid"i*ous*ness\, n. The quality of being perfidious; perfidy. --Clarendon. [1913 Webster]