• WordNet 3.6
    • n beastliness unpleasant nastiness; used especially of nasty weather
    • n beastliness the quality of being deliberately mean
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Webster's Revised Unabridged Dictionary
    • n Beastliness The state or quality of being beastly.
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Century Dictionary and Cyclopedia
    • n beastliness The state or quality of being beastly; brutality; coarseness; vulgarity; filthiness.
    • n beastliness Absence of reason; stupidity.
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In literature:

And it isn't the beastliness of it that matters most!
"Notes from the Underground" by Feodor Dostoevsky
Though it extended through several years, no guilty act I ever heard of detracted from his deserved reputation for beastliness.
"Trifles for the Christmas Holidays" by H. S. Armstrong
No, no; none of those intolerable beastlinesses for him.
"Bella Donna" by Robert Hichens
O detestable madnesse, oh beguiled senses, by your faulte with the selfe same beastlie pleasure, myserable mortall men are ouerthrowne.
"Hypnerotomachia" by Francesco Colonna
He, saying what he thinks of my deception; me, defending myself and the real Ellaline by saying what I think of his general beastliness.
"Set in Silver" by Charles Norris Williamson and Alice Muriel Williamson
It is now drunken with liquor and its own beastliness.
"Lights and Shadows of New York Life" by James D. McCabe
So we have, what is called, the beastliness in the Teuton.
"Villa Elsa" by Stuart Henry
There is beastliness and depravity under his roof compared with which no chapter in the world's history is equal.
"Danger! A True History of a Great City's Wiles and Temptations" by William Howe
For the beastliness of the figure was appalling.
"The Green Rust" by Edgar Wallace
It was due to their low wages and to the beastliness of their employers.
"G. K. Chesterton, A Critical Study" by Julius West