im·pul·sive /ɪmˈpʌlsɪv/
  (a.)衝動的,受感情驅使的,任性的
  im·pul·sive /ɪmˈpəlsɪv/ 形容詞
  衝動的
  Im·pul·sive a.
  1. Having the power of driving or impelling; giving an impulse; moving; impellent.
  Poor men! poor papers! We and they
  Do some impulsive force obey.   --Prior.
  2. Actuated by impulse or by transient feelings.
     My heart, impulsive and wayward.   --Longfellow.
  3. Mech. Acting momentarily, or by impulse; not continuous; -- said of forces.
  Im·pul·sive n. That which impels or gives an impulse; an impelling agent.
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  impulsive
       adj 1: proceeding from natural feeling or impulse without external
              stimulus; "an impulsive gesture of affection" [syn: 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; "a driving
          personal ambition"; "the driving force was his innate
          enthusiasm"; "an impulsive force" [syn: driving]
       4: determined by chance or impulse or whim rather than by
          necessity or reason; "a capricious refusal";
          "authoritarian rulers are frequently capricious"; "the
          victim of whimsical persecutions" [syn: capricious, whimsical]
       5: 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) [syn: hotheaded, impetuous, madcap,
           tearaway(a), brainish]