not common or ordinarily encountered; unusually great in amount or remarkable in character or kind; "uncommon birds"; "frost and floods are uncommon during these months"; "doing an uncommon amount of business"; "an uncommon liking for money"; "he owed his greatest debt to his mother's uncommon ...
rare: marked by an uncommon quality; especially superlative or extreme of its kind; "what is so rare as a day in June"-J.R.Lowell; "a rare skill"; "an uncommon sense of humor"; "she was kind to an uncommon degree"
(uncommonness) extraordinariness as a consequence of being marked by an uncommon or superlative quality
(UnCommons) Uncyclopedia ("the content-free encyclopedia") is a website that parodies Wikipedia. It was founded in 2005. Originally an English-language wiki, the project currently spans over 50 languages. ...
rare; not readily found; unusual; remarkable; exceptional
Unlikely to be encountered; sometimes not present in appropriate habitats. (see abundant, common, rare)
The game or activity does not have to be totally original, but it can't be one like 'Hangman' or 'I Spy' that everybody already knows.
Short for Uncommon Grounds, a local coffee spot frequented by Skiddies.