barbarous       
adjective  formal uk/ˈbɑː.bər.əs/ us/ˈbɑːr.bɚ.əs/
 野蛮的;暴虐的;未开化的;粗野的
extremely cruel or unpleasant, or failing to reach acceptable social standards
  His murder was an outrageous and barbarous act. 对他的谋杀是骇人听闻的野蛮行径。 
 How can they forgive such barbarous behaviour? 他们怎么能原谅这样的野蛮行为? 
 Synonyms: barbaricbrutalcallouscrueldespotichard (SEVERE)harsh (UNKIND)inhumansavage vicious