In a way that shows careful listening or watching; paying close attention to something.
From Latin 'attendere' (to turn toward), composed of 'ad-' (to) and 'tendere' (to stretch). The -ive suffix creates an adjective, then -ly makes it an adverb.
Your brain actually processes information differently when you're attentive—your attention literally changes how your brain filters sensory information, which is why you notice things you weren't paying attention to before!
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