underachiever

noun

1. One who underachieves, i.e. performs less well than expected.

   “Woody Allen has provided what is probably the best theological answer to the problem of evil: God is not evil; He is just an underachiever.”

   “Bart: (reading his permanent record) "Underachiever and proud of it." How old is this thing?”

   “For the TLC undertaking, he employs only underachievers, cronies who have been hired for their ability to make the work site madcap and, therefore, filmable.”

   “This unsung, underrated, under-appreciated / The one them underachievers had underestimated / Finally graduated, I'm one of the most hated”