beyond (one's) ken

Advanced beyond one's ability to understand or make sense of the subject matter or task at hand. The stuff they're teaching in this advanced math class is beyond my ken.

Common Names:

Name	Pronounced	Usage
Flavie	fla-VEE	French
VÍKingr	-	Ancient Scandinavian
Carlene	KAHR-leen	English
Andromeda	an-DRAW-mə-də (English)	Greek Mythology
Debby	DEB-ee	English
Fedlimid	-	Ancient Irish, Irish Mythology