uncommon /ʌnˈkɒmən/adjective 2adverb 1forms 4 adjective2 •Rare; not readily found; unusual.Bald eagles are an uncommon sighting in this state. •Remarkable; exceptional.The diamond was of uncommon size adverb1 •(dialect, no longer used) Exceedingly, exceptionally.‘Is Suffolk your county, sir?’ asked William. ‘Yes,’ I said, with some importance. ‘Suffolk’s my county.’ ‘I’m told the dumplings is uncommon fine down there,’ said William. — 1849 formsmore uncommon · uncommoner · most uncommon · uncommonest