nonachiever

/ˌnɑnəˈtʃivər/
noun
  1. A person who does not perform well or succeed, especially in school or work.
    • The program is designed to motivate nonachievers and help them reach their potential.
    • The teacher tried to help the nonachiever in her class by giving extra assignments.
    • He was labeled a nonachiever early on, but later became a successful entrepreneur.
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