adverb
modifies a verb, adjective, or another adverb by providing information on how the action is done
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The research team diligently worked on the project for months to ensure accuracy.
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She diligently studied for her exams all week long.
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I've been diligently hustling to get this side project off the ground.
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Like a bee diligently collecting nectar, she worked tirelessly towards her goals.