Meaning : Proceeding from natural feeling or impulse without external stimulus.
Example :
An impulsive gesture of affection.
Synonyms : unprompted
Meaning : Without forethought.
Example :
Letting him borrow her car was an impulsive act that she immediately regretted.
Meaning : Having the power of driving or impelling.
Example :
A driving personal ambition.
The driving force was his innate enthusiasm.
An impulsive force.
Synonyms : driving
Meaning : Determined by chance or impulse or whim rather than by necessity or reason.
Example :
A capricious refusal.
Authoritarian rulers are frequently capricious.
The victim of whimsical persecutions.
Synonyms : capricious, whimsical