The Collaborative International Dictionary of English v.0.48:
Beastliness \Beast"li*ness\, n. The state or quality of being beastly. [1913 Webster]WordNet (r) 3.0 (2006):
beastliness n 1: the quality of being deliberately mean [syn: beastliness, meanness] 2: unpleasant nastiness; used especially of nasty weather