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
Hatty	HAT-ee	English
Halsten	-	Swedish
Kuldeep	-	Indian (Sikh)
Valeria	vah-LE-ryah (Italian), bah-LE-ryah (Spanish)	Italian, Spanish, Romanian, German, Ancient Roman
Delara	-	Persian
Karthik	-	Tamil, Indian, Telugu, Malayalam