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
Elma	['elmə]
Astill	['æstil]
Hatim	-	Arabic
Jung-Hee	jung-hee	Korean
Crystin	-	Welsh
Hadrian	HAY-dree-ən (English)	History