Translation

残虐な / 野蛮な / 非人道的な

Meaning

Barbarous means extremely cruel, brutal, or uncivilized in a way that shocks moral standards. It is formal and often describes acts, punishments, conditions, or treatment.

Examples

• その囚人への扱いは非人道的だと批判されました。
  The treatment of the prisoners was condemned as barbarous.
• その法律は残虐な刑罰を認めていました。
  The law allowed barbarous punishments.