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
Elke (2)	-	Hebrew
Diederick	DEE-də-rik	Dutch
Walenty	vah-LEN-ti	Polish
Sverrir	-	Ancient Scandinavian, Icelandic
Marilyn	MER-ə-lin, MER-lin, MAR-ə-lin, MAR-lin	English
Dileep	-	Indian, Hindi, Marathi, Malayalam, Kannada, Tamil, Telugu