be beyond (one's) ken

To be 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
Haywood	HAY-wuwd	English
Flore	-	French
Alicja	ah-LEETS-yah	Polish
Hatshepsut	haht-SHEP-soot (English)	Ancient Egyptian
Toygar	-	Turkish
Adair	[ə'dɛə]