bes ‧ ti ‧ al /ˈbesti ə l $ ˈbestʃ ə l/ BrE AmE adjective literary
[ Date: 1300-1400 ; Language: Old French ; Origin: Latin bestialis , from bestia 'beast' ]
behaving like an animal, especially in a cruel way:
bestial and barbaric acts
—bestially adverb