be beyond somebody

be beyond (one)

To be very difficult for one to comprehend or do. Why she loves sports so much is beyond me. Personally, I never saw the appeal of running around and getting sweaty. Of course I'm calling a professional—installing a new heater is beyond me.
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be beˈyond somebody

(informal) be impossible for somebody to imagine, understand or do: Why she decided to marry such a boring man is beyond me.Some of the questions in that exam were beyond me, I’m afraid.
See also: beyond, somebody