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Adjective: impulsive  im'púl-siv
  1. Proceeding from natural feeling or impulse without external stimulus
    "an impulsive gesture of affection";
    - unprompted
     
  2. Without forethought
    "letting him borrow her car was an impulsive act that she immediately regretted"
     
  3. Having the power of driving or impelling
    "an impulsive force";
    - driving
     
  4. Determined by chance or impulse or whim rather than by necessity or reason
    - capricious, whimsical, vagarious
     
  5. Characterized by undue haste and lack of thought or deliberation
    "liable to such impulsive acts as hugging strangers";
    - hotheaded, impetuous, madcap, tearaway, brainish [archaic]

See also: arbitrary, dynamic, dynamical, incautious, self-generated, spontaneous, unpremeditated

Encyclopedia: Impulsive