What is another word for "unique"?

Roget's Thesaurus (1911) lists these synonyms for "unique": abstract, ace, alone, and, another, apart, atomic, azygous, bear, beat, but, cast, chalk, cheese, class, combine, compact, creativeness, daisy, desolate, differ, difference, different, dine, disjoin, disjunction, disparate, disparity, dissemblance, dissimilar, dissimilarity, divergence, divergent, diversified, diversify, diversity, dock, dreary, else, far.