Noun
the property of being wild or turbulent
Source: WordNetBe calm in arguing; for fierceness makes error a fault, and truth discourtesy. George Herbert
We loved each other with a premature love, marked by a fierceness that so often destroys adult lives. Vladimir Nabokov
He was a horse of goodly countenance, rather expressive of vigilance than fire; though an unnatural appearance of fierceness was thrown into it by the loss of his ears, which had been cropped pretty close to his head. Augustus Baldwin Longstreet
The man resolved, and steady to his trust, Inflexible to ill, and obstinately just, May the rude rabble's insolence despise, Their senseless clamours and tumultuous cries; The tyrant's fierceness he beguiles, And the stern brow, and the harsh voice defies, And with superior greatness smiles. Joseph Addison
And say, has fame so dear, so dazzling charms? Must brutal fierceness and the trade of arms, Conquest, and laurels dipped in blood, be prized, While life is scorned, and all its joys despised? Luís de Camões
Should anyone bring against me an accusation of sensuality he would be wrong, for all the fierceness of my senses never caused me to neglect any of my duties. Giacomo Casanova