beastly

Beastly, a.

1. Pertaining to, or having the form, nature, or habits of, a beast. Beastly divinities and droves of gods. Prior.

2. Characterizing the nature of a beast; contrary to the nature and dignity of man; brutal; filthy. The beastly vice of drinking to excess. Swift.

3. Abominable; as, beastly weather. [Colloq. Eng.]

Syn. -- Bestial; brutish; irrational; sensual; degrading.

Shades of meaning

Fernald has no entry of its own for beastly; he lists it under brutish.

Where he writes about it:

Beastly refers largely to the outward and visible consequences of excess; as, beastly drunkenness. — from brutish