impulsive

Etymology

Borrowed from Middle French impulsif, from Latin impulsivus.

adj

1. Having the power of driving or impelling; giving an impulse; moving; impellent.
2. Actuated by impulse or by transient feelings; inclined to make rapid decisions without due consideration.
3. (mechanics) Acting momentarily, or by impulse; not continuous – said of forces.

noun

1. That which impels or gives an impulse; an impelling agent.
   Notwithstanding all which Motives and impulsives , Sir Thomas Overbury refused to be sent abroad , with such terms 1613, Henry Wotton, letter to Edmund Bacon
2. One whose behaviour or personality is characterized by being impulsive.