S: (adj) inert, indifferent, neutral (having only a limited ability to react chemically; chemically inactive) "inert matter"; "an indifferent chemical in a reaction"
S: (adj) neutral (not supporting or favoring either side in a war, dispute, or contest)
S: (adj) neutral (possessing no distinctive quality or characteristics)
W: (adj) positive [Opposed to: neutral] (characterized by or displaying affirmation or acceptance or certainty etc.) "a positive attitude"; "the reviews were all positive"; "a positive benefit"; "a positive demand"
W: (adj) negative [Opposed to: neutral] (characterized by or displaying negation or denial or opposition or resistance; having no positive features) "a negative outlook on life"; "a colorless negative personality"; "a negative evaluation"; "a negative reaction to an advertising campaign"
S: (adj) achromatic, neutral (having no hue) "neutral colors like black or white"
S: (adj) neutral (lacking distinguishing quality or characteristics) "a neutral personality that made no impression whatever"