overachiever

See also: over-achiever

English

over- +‎ achiever

overachiever (plural overachievers)

One who overachieves; one who has too much success. [from 1950s]
Antonym: underachiever
- 1980, Susan Sontag, "Mind as Passion" in Under the Sign of Saturn, New York: Vintage, 1981, pp. 192-3,
  It is the portrait of one of the great teacher-parents, a zealot of European high culture self-confidently at work before the time that turned such a parent into a selfish tyrant and such a child into an "overachiever," to use the philistine label which conveys the contemporary disdain for precocity and intellectual ardor.

one who overachieves