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
Thiago	-	Portuguese (Brazilian)
Beauregard	BO-rə-gahrd	English (Rare)
Shemaiah	-	Biblical
Sadie	SAY-dee	English
Anders	AHN-desh (Swedish), AHN-ders (Swedish, Danish)	Swedish, Norwegian, Danish
Kim (1)	KIM	English