Definitions of neutral:

• noun:   one who does not side with any party in a war or dispute
• adjective:   neither moral nor immoral; neither good nor evil, right nor wrong
• adjective:   of no distinctive quality or characteristics or type
• adjective:   having no net electric charge; not electrified
• adjective:   lacking hue

  Example: "Neutral colors like back or white"

• adjective:   lacking distinguishing quality or characteristics

  Example: "A neutral personality that made no impression whatever"

• adjective:   not supporting or favoring either side in a war, dispute, or contest
• adjective:   having no personal preference

  Example: "A neutral observer"

• adjective:   having only a limited ability to react chemically; not active