Definition of impetuous adjective from the Oxford Advanced Learner's Dictionary

 

impetuous

 adjective
adjective
BrE BrE//ɪmˈpetʃuəs//
 
; NAmE NAmE//ɪmˈpetʃuəs//
 
 
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acting or done quickly and without thinking carefully about the results synonym rash, impulsive an impetuous young woman an impetuous decision Word Origin late Middle English: from Old French impetueux, from late Latin impetuosus, from impetere ‘to attack’.
See the Oxford Advanced American Dictionary entry: impetuous