nonperformer

/ˌnɑnpərˈfɔrmər/
noun
  1. A person or thing that does not perform as expected or required.
    • This stock has been a nonperformer for years.
    • The manager had to let go of several nonperformers on the team.
    • In a school, a nonperformer may need extra tutoring.
Antonyms
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