" nonpartisan "

1: marked by justice, honesty, and freedom from bias;

  * e.g., " ... made a nonpartisan decision that satisfied all concerned "

•  Synonyms : 

•  candid,

•  disinterested,

•  dispassionate,

•  equal,

•  equitable,

•  evenhanded,

•  fair,

•  impartial,

•  indifferent,

•  just,

•  objective,

•  square,

•  unbiased,

•  unprejudiced

•  Antonyms : 

•  biased,

•  ex parte,

•  inequitable,

•  nonobjective,

•  one-sided,

•  partial,

•  parti pris,

•  partisan,

•  prejudiced,

•  unjust

2: not favoring or joined to either side in a quarrel, contest, or war;

  * e.g., " ... nonpartisan observers who were there to ensure a fair election "

•  Synonyms : 

•  neutral

•  Antonyms : 

•  allied,

•  confederate