impulsive /ɪmˈpʌlsɪv/ adjective Learner's definition of IMPULSIVE
[more impulsive; most impulsive]
1
: doing things or tending to do things suddenly and without careful thought : acting or tending to act on impulse易冲动的;任性的 2
: done suddenly and without planning : resulting from a sudden impulse由冲动造成的;冲动的
— impulsiveness
noun [noncount]