brutal vs beastly

brutal and beastly both are adjectives.

Word	Noun	Adjective	Verb	Adverb
brutal	No	Yes	No	No
beastly	No	Yes	No	Yes

As adjectives, brutal and beastly are synonyms defined as:

brutal and beastly: resembling a beast; showing lack of human sensibility

Other synonyms of brutal include bestial, brute, brutish.

brutal (adjective)	beastly (adjective)
disagreeably direct and precise	resembling a beast; showing lack of human sensibility
resembling a beast; showing lack of human sensibility	(informal) very unpleasant
punishingly harsh
(of persons or their actions) able or disposed to inflict pain or suffering

brutal (adverb)	beastly (adverb)
	in a beastly manner