What is the meaning of impulsive?

adjective

• Proceeding from natural feeling or impulse without external stimulus.
  • usage: "an impulsive gesture of affection"
  • synonyms: unprompted
• Without forethought.
  • usage: "letting him borrow her car was an impulsive act that she immediately regretted"
• Having the power of driving or impelling.
  • usage: "a driving personal ambition"; "the driving force was his innate enthusiasm"; "an impulsive force"
  • synonyms: driving
• Determined by chance or impulse or whim rather than by necessity or reason.
  • usage: "a capricious refusal"; "authoritarian rulers are frequently capricious"; "the victim of whimsical persecutions"
  • synonyms: capricious, whimsical
• Characterized by undue haste and lack of thought or deliberation."a hotheaded decision"; "liable to such impulsive acts as hugging strangers"; "an impetuous display of spending and gambling"; "madcap escapades"; (`brainish' is archaic)
  • synonyms: hotheaded, impetuous, madcap, tearaway, brainish