impetuousness       
noun [ U ] uk/ɪmˈpetʃ.u.əs.nəs/ us/ɪmˈpetʃ.u.əs.nəs/ (formal also impetuosity, /ɪmˌpetʃ.uˈɒs.ə.ti/ /ɪmˌpetʃ.uˈɑː.sə.t̬i/)
 轻率,草率
the quality or fact of doing things suddenly, without considering the results of your actions
  She has a youthful impetuousness. 她有一种青春的冲动。 
 It was a moment of reckless impetuousness. 那是一时鲁莽的轻率决定。 
 See: impetuous
 - More examples
 - It was his impetuousness that ruined his career.
 - Her hot-headed impetuousness clashed with his icy resolve.
 - He is not given to impetuousness.
 - The racecar was destroyed in a split-second's impetuousness.