a.

1. 性急的，魯莽的；衝動的
   It was impetuous of her to do that.

   她竟做那種事，真是魯莽。

2. 狂暴的，猛烈的；奔騰的
   an impetuous wind

   狂風

   The dam broke and an impetuous torrent of water swept away the town.

   堤壩崩塌了，奔騰的急流沖垮了鎮子。

adj.

1. acting or done quickly and rashly.
2. moving forcefully or rapidly.