noun

cruel behaviour or attitudes.

he has treated her with extreme cruelty

brutality,savagery,savageness,inhumanity,barbarism,barbarousness,brutishness,bloodthirstiness,murderousness,viciousness,ferocity,ferociousness,fierceness,callousness,sadism,ruthlessness,relentlessness,mercilessness,pitilessness,remorselessness,lack of regard,lack of sympathy,lack of charity,heartlessness,cold-heartedness,cold-bloodedness,severity,harshness,inclemency,wickedness,badness,baseness,iniquity,blackness,black-heartedness,evil,fiendishness,devilishness,heinousness,nastiness,unkindness,abuse,ferity