In a way that is driven by sudden urges or desires without thinking carefully first.
From Latin 'impellere' (to drive or push forward) forming 'impulse,' with the adverb suffix '-ly' added. It describes action without forethought.
Neuroscience shows our brains physically can't check all impulses equally—children's prefrontal cortexes aren't fully developed, which is why they impulsively do things teens and adults can better resist.
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