Neutral

    1.not taking part or giving assistance in a dispute or war between others: a neutral nation during World War II.
    2.not aligned with or supporting any side or position in a controversy: The arbitrator was absolutely neutral.
    3.of or belonging to a neutral state or party: neutral territory.
    4.of no particular kind, characteristics, etc.; indefinite: a neutral personality that made no impression whatever; a sex-neutral job title.
    5.
      a.gray; without hue; of zero chroma; achromatic.
      b.matching well with many or most other colors or shades, as white or beige.

Source

dictionary.reference.com