ferocity[noun]Synonyms: savagery, bloodthirstiness, brutality, cruelty, fierceness, viciousness, wildness 
 [TahlilGaran] English Synonym Dictionary ▲
 fe‧ro‧ci‧ty /fəˈrɒsəti, fəˈrɒsɪti $ fəˈrɑː-/ 
 noun [uncountable] the state of being extremely violent and severe
ferocity of Detectives were shocked by the ferocity of the attack.
 Detectives were shocked by the ferocity of the attack.  [TahlilGaran] Dictionary of Contemporary English ▲