Longman Dictionary of Contemporary English homepage

underachiever

 noun
     
un‧der‧a‧chiev‧er [countable]
someone who does not do as well at school or at work as they could do if they worked harder
—underachieve verb [intransitive]
—underachievement noun [uncountable]
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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