impulsive

Relating to or actuated by an impulse, rather than controlled by reason or careful deliberation.

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im·pul·sive im-'pəl-siv adj

1) having the power of or actually driving or impelling

2) actuated by or prone to act on impulse <\impulsive behavior>

3) acting momentarily <brief \impulsive auditory stimuli>

im·pul·sive·ly adv

im·pul·sive·ness n

im·pul·siv·i·ty -.pəl-'siv-ət-ē n, pl -ties