Pertaining to, or having the form, nature, or habits of, a beast.

Characterizing the nature of a beast; contrary to the nature and dignity of man; brutal; filthy.

resembling a beast; showing lack of human sensibility; "beastly desires"; "a bestial nature"; "brute force"; "a dull and brutish man"; "bestial treatment of prisoners"

Abominable; as, beastly weather.

very unpleasant; "hellish weather"; "stop that god-awful racket"

in a beastly manner; "she behaved beastly toward her mother-in-law"