nonpartisan

From non- +‎ partisan.

nonpartisan (not comparable)

1. Not partisan; impartial and unbiased.

   Synonyms: disinterested, unpartisan; see also Thesaurus:impartial

   • 2000 August 24, William Safire, “Essay; Pardon Me, But . . .”, in The New York Times‎^[1], archived from the original on 3 February 2018:

     This means Gore will have to stop dancing away from the question as if the pardon decision were somehow shared with the pardonee. It's time he chose the hard right over the easy wrong answer. (For Bush, it would be an opportunity to demonstrate nonpartisan compassion on a grand scale.)

• non-partisan

nonpartisan (plural nonpartisans)

1. One who is not a partisan.
2. A person who has not selected or declared a side or party.
   • 2008 January 29, Jennifer Steinhauer, “California’s Unaffiliated Voters Are Sometimes Unreachable”, in The New York Times‎^[2], archived from the original on 5 January 2018:

     “The first thing is that nonpartisans as a group are occasional voters,” Mr. DiCamillo said. “They are not as engaged in politics. They view the parties as being too partisan and migrated to nonpartisan.”

• nonaspirant