noun

Extreme cruelty or brutality.

the barbarity of the act outraged millions

brutality,brutalism,cruelty,bestiality,barbarism,barbarousness,savagery,viciousness,fierceness,ferocity,wickedness,nastiness,ruthlessness,remorselessness,mercilessness,villainy,murderousness,heinousness,nefariousness,monstrousness,baseness,vileness,inhumanity,blackness,fiendishness,black-heartedness,hellishness,ghastliness,horror