Noun
The condition or quality of being impetuous; fury; violence.
Vehemence, or furiousnes of temper.
Source: Webster's dictionaryIt takes great labor to uncover the convincing simple speech of the heart. Poetic candor comes with hard labor, so even does impetuosity and impudence. Kenneth Rexroth
His Armies, weakened by defeat and defeat, dispirited by misfortune, had unlearned - under beaten generals - that warlike impetuosity which as it is the consequence, so it is the guarentee of success. Friedrich Schiller