impetuous
1. [ adjective ] characterized by undue haste and lack of thought or deliberation
Synonyms: impulsive madcap tearaway brainish hotheaded
Examples:

"a hotheaded decision" "liable to such impulsive acts as hugging strangers" "an impetuous display of spending and gambling" "madcap escapades" (`brainish' is archaic)

Related terms: archaism incautious
2. [ adjective ] marked by violent force
Examples:

"impetuous heving waves"

Related terms: forceful
Similar spelling:   impetuously
  impetus
  impetuosity
  impetiginous
  impetigo
  impede
  impiety
  impeded