outside (one's) ken

outside (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 outside my ken.
See also: ken, outside
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

beyond/outside your ˈken

(old-fashioned) not within your knowledge or understanding: Such things are beyond my ken.
Ken is an old word for ‘knowledge’.
See also: beyond, ken, outside
Farlex Partner Idioms Dictionary © Farlex 2017
See also: