neutral

having no personal preference

“a neutral observer”

having no hue

“neutral colors like black or white”

having only a limited ability to react chemically; chemically inactive

having no net electric charge

lacking distinguishing quality or characteristics

“a neutral personality that made no impression whatever”

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

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

possessing no distinctive quality or characteristics