noun
the quality or state of being irrelevant; something that is not pertinent or applicable to a particular matter
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The data presented in the report is full of irrelevance and does not contribute to the main findings.
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I don't understand why she keeps bringing up irrelevant points, it's just adding to the confusion.
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Stop talking nonsense, your comments are pure irrelevance.
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In the grand scheme of things, his opinion on the matter is of little irrelevance.