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
Badr	-	Arabic
Wills	[wilz]
Bernt	-	Swedish, Norwegian, Danish
Keira	-	English (Modern)
Ronda	RAHN-də	English
Joord	YO:RT	Dutch