impulsive

adjective ! Definition from WordNet 3.1, Princeton University. Pronunciation from Wiktionary, via Kaikki.org. More about impulsive at Wordnik → Where our words come from →

1. Proceeding from natural feeling or impulse without external stimulus.

   an impulsive gesture of affection

2. Without forethought.

   letting him borrow her car was an impulsive act that she immediately regretted

3. Having the power of driving or impelling.

   a driving personal ambition