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underachiever

noun [C]
 
 
/ˌʌn.də.rəˈtʃiː.vər/ US  /-dɚ.əˈtʃiː.vɚ/

Definition

someone who is less successful than they should be at school or at workFailuresAccidents and disastersHigher and lower points of achievement
(Definition of underachiever noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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