under-represented

adjective
  1. 1

    Having inadequate representation.

verb
  1. 1

    To represent something as being lower or smaller than is the case.

  2. 2

    To give something insufficient or inadequate representation.

Source: https://en.wiktionary.org/wiki/under-represent, https://en.wiktionary.org/wiki/under-represented, https://en.wiktionary.org/wiki/underrepresent