third rater

/θɜrd ˈreɪtər/
noun
  1. A person or thing that is of very poor quality or low skill level.
    • The coach called him a third-rater after he missed every shot.
    • Don't hire a third-rater for the job; pay for someone with real talent.
    • That old car is a third-rater; it breaks down constantly.
Antonyms
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