Definition of beastly adjective from the Oxford Advanced Learner's Dictionary

 

beastly

 adjective
adjective
BrE BrE//ˈbiːstli//
 
; NAmE NAmE//ˈbiːstli//
 
(old-fashioned, British English, informal)
 
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unpleasant synonym horrible, nasty Don’t be so beastly to him! This car’s been nothing but trouble—I wish I’d never bought the beastly thing!
See the Oxford Advanced American Dictionary entry: beastly