adverb
An adverb modifies or describes a verb, adjective, or another adverb. It often answers the questions how, when, where, or to what extent. In this case, 'pointlessly' describes how something is done without a point or purpose.
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The project manager pointed out that the team was pointlessly wasting time on unnecessary tasks.
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I don't understand why she always argues pointlessly about the smallest things.
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Stop talking pointlessly, it's getting annoying.
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His efforts to change her mind were like trying to move a mountain pointlessly.