underachiever - definition and synonyms

noun [countable] 

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/ˌʌndərəˈtʃiːvə(r)/
singularunderachiever
pluralunderachievers
  1. someone who is not as successful as they could be at work, school etc

derived words

underachieve

verb [intransitive]
present tense
I/you/we/theyunderachieve
he/she/itunderachieves
present participleunderachieving
past tenseunderachieved
past participleunderachieved

underachievement

noun [uncountable]
 Synonyms and related words