'Barbarousness' definitions:

Definition of 'barbarousness'

From: WordNet
noun
The quality of being shockingly cruel and inhumane [syn: atrocity, atrociousness, barbarity, barbarousness, heinousness]

Definition of 'Barbarousness'

From: GCIDE
  • Barbarousness \Bar"ba*rous*ness\, n. The quality or state of being barbarous; barbarity; barbarism. [1913 Webster]