behaviour in which you do things suddenly without any planning and without considering the effects they may have

He had rushed into the relationship too quickly, and regretted his impulsiveness. 他太过匆忙地投入到这段感情中，对自己的冲动很是后悔。

She had to learn how to curb her impulsiveness. 她必须学会如何克制自己的冲动。