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
VÉRÈNe	-	French
Brennan	['brenən]
Andronicus	-	Ancient Greek (Latinized)
Thompson	['tɔmpsn]
Winston	WIN-stən	English
Muriel	MYUR-ee-əl (English), MUR-ee-əl (English), muy-ree-EL (French)	English, French, Irish