impetuous

Etymology

From Middle English impetuous, from Old French impetueux, from Late Latin impetuōsus (“violent”), from Latin impetus (“attack, violence”).

adj

1. Making arbitrary decisions, especially in an impulsive and forceful manner.
   But it was natural, that the impetuous, restless young artist should incline more to excess of strength than of delicacy in his playing. 1880, John Weeks Moore, “Beethoven, Louis Van”, in Complete Encyclopaedia of Music
2. Characterized by sudden violence or vehemence.
   He stands, and views in the faint rays Far, far below, the torrent's rising surge, And listens to the wild impetuous roar 1794, Ann Radcliffe, The Mysteries of Udolpho, vol. II, chapter I
   "Oh! where, where is my uncle?" cried Elizabeth, darting from her seat as she finished the letter, in eagerness to follow him, with-out losing a moment of the time so precious; but as she reached the door, it was opened by a servant, and Mr. Darcy appeared. Her pale face and impetuous manner made him start […] 1813, Jane Austen, chapter 4, in Pride and Prejudice, volume III
   Having made a few vain attempts at engrossing my attention in my book, I was obliged to let myself be carried away by the impetuous torrent of the squire's eloquence. 1886, Peter Christen Asbjørnsen, translated by H.L. Brækstad, Folk and Fairy Tales, page 250
   1917 rev. 1925, Ezra Pound, "Canto I" Unsheathed the narrow sword, I sat to keep off the impetuous impotent dead ...