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