形容词

1. 急躁的;冲动的
If you describe someone as impetuous, you mean that they are likely to act quickly and suddenly without thinking or being careful.

1. characterized by undue haste and lack of thought or deliberation
(`brainish' is archaic)

e.g. a hotheaded decision
liable to such impulsive acts as hugging strangers
an impetuous display of spending and gambling
madcap escapades

Synonym: hotheadedimpulsivemadcaptearaway(a)brainish

2. marked by violent force

e.g. impetuous heaving waves