impetuous

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im·pet·u·ous / imˈpechoōəs/ • adj. acting or done quickly and without thought or care: her friend was headstrong and impetuous. ∎  moving forcefully or rapidly: an impetuous but controlled flow of water.DERIVATIVES: im·pet·u·os·i·ty / -ˌpechoōˈäsitē/ n.im·pet·u·ous·ly adv.im·pet·u·ous·ness n.