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impulsive, unprompted | proceeding from natural feeling or impulse without external stimulus | ||
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impulsive | without forethought | ||
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impetuous, hotheaded, impulsive, madcap, tearaway, brainish | characterized by undue haste and lack of thought or deliberation | ||
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impulsive, capricious, whimsical | determined by chance or impulse or whim rather than by necessity or reason | ||
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driving, impulsive | having the power of driving or impelling |