bestial
adjective /ˈbestiəl/
  /ˈbestʃəl/
(formal)- cruel and horrible; of or like a beast
- bestial acts/cruelty/noises
 - He referred to their actions as ‘these bestial and barbaric acts’.
 
Word Originlate Middle English: via Old French from late Latin bestialis, from Latin bestia ‘beast’.