Englishferocity
noun
detectives were shocked by the ferocity of the attack:
savagery, brutality, brutishness, barbarity, fierceness, violence, aggression, bloodthirstiness, murderousness;
ruthlessness, cruelty, pitilessness, mercilessness, heartlessness, inhumanity, sadism;
intensity, severity, extremity, force, strength;
rare ferity.
▷antonyms gentleness.
ferocity Oxford Dictionary of English