Open English Wordnet
Adjectives
(s)beastly, bestial, brute, brutish, brutalresembling a beast; showing lack of human sensibility“beastly desires”,
“a bestial nature”,
“brute force”,
“a dull and brutish man”,
“bestial treatment of prisoners” Adverbs
(r)beastlyin a beastly manner“she behaved beastly toward her mother-in-law”