No Encyclopedia Entry for Impulsive
Noah Webster's New International Dictionary of the English Language
1. (a.) Inclined to act on transient feelings; unpremeditated.
2. (a.) Having the power of driving or impelling; giving an impulse; moving; impellent.
3. (a.) Acting momentarily, or by impulse; not continuous; -- said of forces.
4. (n.) That which impels or gives an impulse; an impelling agent.