impetuous

/ɪmˈpɛtʃəwəs/

/ɪmˈpɛtʃuɪs/

Someone impetuous acts too hastily or carelessly. Hotheaded, impulsive folks are impetuous.

If you're a careful person who thinks everything through and doesn't act rashly, then you're not very impetuous. Impetuous has to do with doing things on the spur of the moment — and not good things. Being impetuous usually goes along with being impatient and easily angered. If you're impetuous, you act quickly and thoughtlessly when you should just take a deep breath, relax, and think about the best thing to do.

Definitions of impetuous

1. adjective

   characterized by undue haste and lack of thought or deliberation
   “an impetuous display of spending and gambling”

   synonyms: brainish, hotheaded, impulsive, madcap, tearaway

   incautious

   lacking in caution
2. adjective

   marked by violent force
   “impetuous heaving waves”

   synonyms:

   forceful

   characterized by or full of force or strength (often but not necessarily physical)