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Definition of ferocity : Savage wildness or fierceness; fury; cruelty; as, ferocity of countenance.

Synonyms:

craze, pitch, hysteria, severity, vehemency, abandon, delirium, big, ferociousness, strong, cruelty, madness, depth, emphasis, force, furiousness

destructiveness, insurrection, broil, vandalism, brutishness, frenzy, atrocity, outrage, brawl, wildness, abuse, fracas, attack, barbarity, vehemence, thuggery, fierceness, violence, inhumanity, savagery, fight, terrorism, fury, assault, commotion, brutality, torture, turmoil, rage, intensity, uproar

Usage examples:

• They worked in the close neighbourhood of death, and at any moment, between one round and another, a battery and its gun teams might be blown up by one of those howling beasts which seem to gather strength and ferocity at the end of their flight before the final roar of destruction. - "From Bapaume to Passchendaele, 1917", Philip Gibbs.
• The very ferocity with which the pretensions of the Court were assailed in certain quarters was indirect proof of its power, but there was also direct testimony of a high order. - "John Marshall and the Constitution A Chronicle of the Supreme Court, Volume 16 In The Chronicles Of America Series", Edward S. Corwin.
• One can picture the victim in some lucid moment, awakening to consciousness only to shudder in his dreadful home, and scared back again into that ferocity which is the child of terror. - "The Gospel According to St. Mark", G. A. Chadwick.