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
4.determined by chance or impulse or whim rather than by necessity or reason;
a capricious refusal
5.characterized by undue haste and lack of thought or deliberation;
a hotheaded decision