of, pertaining to, or characterized by sudden or rash action, emotion, etc.; impulsive: an impetuous decision; an impetuous person.
2.
having great impetus; moving with great force; violent: the impetuous winds.
Origin: 1350–1400; Middle English < Anglo-French < Late Latin impetuōsus, equivalent to Latin impetu(s) impetus + -ōsus-ous
Related forms
im·pet·u·ous·ly, adverb
im·pet·u·ous·ness, noun
Can be confused:compulsive, impulsive, impetuous (see synonym note at the current entry).
Synonyms 1. eager, headlong. Impetuous,impulsive both refer to persons who are hasty and precipitate in action, or to actions not preceded by thought. Impetuous suggests eagerness, violence, rashness: impetuous vivacity; impetuous desire; impetuous words. Impulsive emphasizes spontaneity and lack of reflection: an impulsive act of generosity.