What is another word for "neutral"?

Roget's Thesaurus (1911) lists these synonyms for "neutral": accord, all, amity, and, another, ash-colored, ashen, ashy, average, balance, black, bloodless, blown, calcareous, call, calm, calumet, chiaroscuro, cinereous, cineritious, common, commonplace, compromise, concord, cool, course, denominator, desert, difference, dingy, dove, dovish, down, drab, dun, favillous, for, friendship, generality, golden.