noun
the quality of acting on impulse or without forethought
adjective
impulsive (related to or characterized by impulsiveness)
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His impulsiveness often led to hasty decisions that he later regretted.
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She tends to act on impulsiveness without thinking things through.
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Dude, your impulsiveness is gonna get you in trouble one day.
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The impulsiveness of the storm caused chaos and destruction in its path.