impulsiveness

US /ɪmˈpʌl.sɪv.nəs/
UK /ɪmˈpʌl.sɪv.nəs/
1.

sự bốc đồng

behavior 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.