Pronunciation: (im-pul'siv), [key]
1. actuated or swayed by emotional or involuntary impulses: an impulsive child.
2. having the power or effect of impelling; characterized by impulsion: impulsive forces.
3. inciting to action: the impulsive effects of a revolutionary idea.
4. Mech.(of forces) acting momentarily; not continuous.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.