/ ɪmˈpetʃuəs; NAmE / adjective
acting or done quickly and without thinking carefully about the results
SYN rash , impulsive :
an impetuous young woman
an impetuous decision
► im·petu·os·ity / ɪmˌpetʃuˈɒsəti; NAmE -ˈɑːsəti/ noun [ U ]
► im·petu·ous·ly adverb
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WORD ORIGIN
late Middle English : from Old French impetueux , from late Latin impetuosus , from impetere to attack.