What does "impulsive" mean?

Impulsive: Actuated by impulse or by transient feelings. My heart, impulsive and wayward. Longfellow.

Additional senses

  1. 2.(Mech.) Acting momentarily, or by impulse; not continuous; -- said of forces.
  2. 3.That which impels or gives an impulse; an impelling agent. Sir W. Wotton.

Sources