a.

1. 性急的，鲁莽的；冲动的
   It was impetuous of her to do that.

   她竟做那种事，真是鲁莽。

2. 狂暴的，猛烈的；奔腾的
   an impetuous wind

   狂风

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

   堤坝崩塌了，奔腾的急流冲垮了镇子。

adj.

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