adverb
An adverb is a word that modifies or describes a verb, adjective, or another adverb. In this case, 'carelessly' modifies how an action is performed.
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The employee handled the sensitive documents carelessly, leading to a data breach.
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She carelessly left her phone on the table and it got knocked off.
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He carelessly spilled his drink all over the new carpet.
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She danced carelessly through life, never worrying about consequences.