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]

Impulsive \Im*pul"sive\, a. [Cf. F. impulsif.]
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.

Impulsive \Im*pul"sive\, n. That which impels or gives an impulse; an impelling agent. --Sir W. Wotton.

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