(a.) Not common; unusual; infrequent; rare; hence, remarkable; strange; as, an uncommon season; an uncommon degree of cold or heat; uncommon courage.
Thesaurus Entries
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
