Read the dictionary definition of beastly. All definitions for this word.
1. resembling a beast; showing lack of human sensibility
1. beastly desires
2. a bestial nature
3. brute force
4. a dull and brutish man
5. bestial treatment of prisoners
2. (informal) very unpleasant
1. hellish weather
2. stop that god-awful racket
3. in a beastly manner
1. she behaved beastly toward her mother-in-law