ferocity
noun /fəˈrɒsəti/
  /fəˈrɑːsəti/
[uncountable, singular]- violence; aggressive behaviour
- The police were shocked by the ferocity of the attack.
 - She fought back with a ferocity that matched his own.
 
Oxford Collocations Dictionaryadjective- great
 - sheer
 
- with ferocity
 
Word Originmid 16th cent.: from French, or from Latin ferocitas, from ferox, feroc- ‘fierce’.