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
Karolyn	KER-ə-lin, KAR-ə-lin	English
Sarnai	-	Mongolian
Philip	['filip]
Marguerite	mar-gə-REET, mar-GREET	French
Maud	[mɔd]
Baltazar	-	Judeo-Christian Legend