impetuous
他一时冲动买了那辆昂贵的车，现在后悔不已。
He made an ___impetuous purchase of that expensive car and now regrets it.
他那封在凌晨三点冲动发出的辞职邮件，是他后来深深后悔的决定。
His ___impetuous resignation email, sent at three in the morning, was a decision he later deeply regretted.
这个冲动的少年没有告诉任何人就订了一张跨国的单程票。
The ___impetuous teen booked a one-way ticket cross-country without telling anyone.