Dictionary

underachiever

noun un·der·achiev·er \ˌən-dər-ə-ˈchē-vər\

: someone (such as a student or athlete) who does not perform as well or work as hard as he or she can

Full Definition of UNDERACHIEVER

:  one (as a student) that fails to attain a predicted level of achievement or does not do as well as expected
un·der·achieve \-ə-ˈchēv\ intransitive verb
un·der·achieve·ment \-mənt\ noun

First Known Use of UNDERACHIEVER

1952

underachiever

noun un·der·achiev·er \ˌən-dər-ə-ˈchē-vər\   (Medical Dictionary)

Medical Definition of UNDERACHIEVER

:  a person (as a student) who fails to achieve his or her potential or does not do as well as expected
un·der·achieve \-ˈchēv\ intransitive verb, un·der·achieved un·der·achiev·ing
un·der·achieve·ment \-mənt\ noun

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