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 character and ability.
source: WordNet 3.0
Not common; unusual; infrequent; rare; hence, remarkable; strange; as, an uncommon season; an uncommon degree of cold or heat; uncommon courage.
source: Webster 1913
adjective satellite
marked by an uncommon quality; especially superlative or extreme of its kind
What is so rare as a day in June. A rare skill. An uncommon sense of humor. She was kind to an uncommon degree.
