impetuous

äkkipikainen, harkitsematon

raju Making arbitrary decisions, especially in an impulsive and forceful manner.
1880, John Weeks Moore, Complete Encyclopaedia of Music, "s:Complete Encyclopaedia of Music/B/Beethoven, Louis Van|Beethoven, Louis Van":

But it was natural, that the impetuous, restless young artist should incline more to excess of strength than of delicacy in his playing.

He stands, and views in the faint raysFar, far below, the torrent's rising surge,And listens to the wild impetuous roar