Definition of "underachiever" []

• One who underachieves by performing less well than expected. (noun)

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• "Mari was what was known as an underachiever, which even an underachiever knew was sociology code for “overfailer.”"
• "The game, while big and fun, is at its core a love ballad to the underachiever, which is what our hero, Cole McGrath, is."
• "If the underachiever were a mixed drink, he would be a dry martini, one part obscurity (vermouth), and three parts unhappiness (gin)."