furiousness(n = noun.attribute) ferocity, fierceness, fury, vehemence, violence, wildness - the property of being wild or turbulent; "the storm's violence"
is a kind of intensity, intensiveness
has particulars: savageness, savagery
Derived forms adjective furious₂, adjective furious₃, adjective furious₁

   The quality of being furious. [WordNet 1.5]