Beastly \Beast"ly\, 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.

Source: Webster's Revised Unabridged Dictionary (1913)