noun
The word 'underperformance' is a noun that refers to the act of performing at a level that is below expectations or standards.
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The company's underperformance in the third quarter has raised concerns among investors.
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The team's underperformance lately is really disappointing.
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I can't believe the underperformance of that player in the game yesterday.
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Her underperformance in the role was like a dark cloud hanging over the production.