im ‧ pul ‧ sive /ɪmˈpʌlsɪv/ BrE AmE adjective
someone who is impulsive does things without considering the possible dangers or problems first ⇨ rash :
Rosa was impulsive and sometimes regretted things she’d done.
In a burst of impulsive generosity, I offered to pay.
—impulsively adverb :
‘Oh, Anne, I do love you!’ he said impulsively.
—impulsiveness noun [uncountable]