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Definitions

American Heritage® Dictionary of the English Language, Fourth Edition

  1. adj. Inclined to act on impulse rather than thought.
  2. adj. Motivated by or resulting from impulse: such impulsive acts as hugging strangers; impulsive generosity. See Synonyms at spontaneous.
  3. adj. Having force or power to impel or incite; forceful.
  4. adj. Physics Acting within brief time intervals. Used especially of a force.

Century Dictionary and Cyclopedia

  1. Having the power of driving or impelling; moving; impellent.
  2. Actuated or controlled by impulses; swayed by the emotions: as, an impulsive child.
  3. Resulting from impulse: as, impulsive movements or gestures.
  4. In mech., acting by instantaneous impulse, not continuously: said of forces. See force, 8 . Synonyms Rash, quick, hasty, passionate.
  5. n. That which impels; impelling cause or reason.

Wiktionary

  1. adj. Having the power of driving or impelling; giving an impulse; moving; impellent.
  2. adj. Actuated by impulse or by transient feelings.
  3. adj. Acting momentarily, or by impulse; not continuous; -- said of forces.
  4. adj. Highly reactive; people who react quickly or feel emotional

GNU Webster's 1913

  1. adj. Having the power of driving or impelling; giving an impulse; moving; impellent.
  2. adj. Actuated by impulse or by transient feelings.
  3. adj. Acting momentarily, or by impulse; not continuous; -- said of forces.
  4. n. That which impels or gives an impulse; an impelling agent.

WordNet 3.0

  1. adj. having the power of driving or impelling
  2. adj. characterized by undue haste and lack of thought or deliberation
  3. adj. proceeding from natural feeling or impulse without external stimulus
  4. adj. determined by chance or impulse or whim rather than by necessity or reason
  5. adj. without forethought

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‘impulsive’ has been looked up 1941 times, added to 14 lists, and has a Scrabble score of 16.