a double-edged sword

something that causes both advantages and problems His great intelligence was a real double-edged sword because he never felt he could communicate with ordinary people.

Common Names:

Name	Pronounced	Usage
Floella	flo-EL-ə	English (Rare)
Felim	-	Irish
Aphrodisia	-	Ancient Greek
TÓFi	-	Ancient Scandinavian
Gheorghe	-	Romanian
Lesya	-	Ukrainian