Synonyms and related words :
almost unheard-of, appalling, astonishing, at a premium, breakaway, conspicuous, different, egregious, exceptional, extraordinary, extremely, fabulous, fantastic, few, formidable, in short supply, incredible, infrequent, marked, marvelous, notable, noteworthy, noticeable, novel, occasional, of mark, offbeat, original, out of print, out of season, out of stock, outstanding, rare, rarely, recherche, remarkable, scanty, scarce, seldom, seldom met with, seldom seen, signal, singular, slow, sparse, sporadic, strange, striking, sui generis, superior, uncommonly, uncustomary, undreamed-of, unexpected, unfamiliar, unfrequent, unheard-of, unimaginable, unique, unordinary, unthinkable, unthought-of, unusual, unusually, unwonted, wonderful