underachiever
[ uhn-der-uh-chee-ver ]
/ ˌʌn dər əˈtʃi vər /
noun
a student who performs less well in school than would be expected on the basis of abilities indicated by intelligence and aptitude tests, etc.
a person or thing that performs below expectations.
Origin of underachiever
1945–50;
under- +
achiever
Words nearby underachiever
under wraps,
under-,
under-the-counter,
under-the-table,
underachieve,
underachiever,
underact,
underactive,
underage,
underarm,
underarmed