impetuous

adjective2

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
2. •
   Characterized by sudden violence or vehemence.

   • […]and the Thunder, / Wing'd with red Lightning and impetuous rage, / Perhaps hath spent his shafts […] — 1667