barbarity
noun
1 the barbarity of slavery:
brutality, brutalism, cruelty, bestiality, barbarism, barbarousness, savagery, viciousness, fierceness, ferocity, wickedness, nastiness, ruthlessness, remorselessness, mercilessness, villainy, murderousness, heinousness, nefariousness, monstrousness, baseness, vileness, inhumanity, fiendishness, hellishness, ghastliness, horror.
▷antonyms benevolence.