beastly

definition: in a beastly manner
example: You behaved beastly towards your parents last time I was over.
speech part: adverb
synonyms:
definition: resembling a beast
example:
speech part: adjective
synonyms: brutal bestial brute brutish
definition: very unpleasant
example:
speech part: adjective
synonyms: dreadful hellish god-awful

How beastly is being used?