neutral

one who does not side with any party in a war or dispute

having no personal preference; "impersonal criticism"; "a neutral observer"

having only a limited ability to react chemically; chemically inactive; "inert matter"; "an indifferent chemical in a reaction"

not supporting or favoring either side in a war, dispute, or contest

possessing no distinctive quality or characteristics

having no hue; "neutral colors like black or white"

lacking distinguishing quality or characteristics; "a neutral personality that made no impression whatever"

having no net electric charge