nonpartisan

/N AA0 N P AA1 R T AH0 Z AH0 N/
noun
  1. 1

    One who is not a partisan.

  2. 2

    A person who has not selected or declared a side or party.

adjective
  1. 1

    Not partisan; impartial and unbiased

Source: https://en.wiktionary.org/wiki/nonpartisan