underachiever

[uhn-der-uh-chee-ver]
noun
1.
a student who performs less well in school than would be expected on the basis of abilities indicated by intelligence and aptitude tests, etc.
2.
a person or thing that performs below expectations.

Origin:
1945–50; under- + achiever

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
underachieve (ˌundərəˈtʃiːv)
 
vb
(intr) to fail to achieve a performance appropriate to one's age or talents
 
undera'chiever
 
n
 
undera'chievement
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
By placing blame on transient and unprepared students it has washed its hands of the underachiever.
Flexible use of multiple criteria will help to identify the underachiever or the poor test-taker.
They would tell him he was smart but an underachiever, whatever that meant.
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