too difficult

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Matching instructional material to students' level of reading ability facilitates generalization to new material better than presenting material that is too difficult (Daly, Bonfigio, Mattson, Persampieri, & Foreman-Yates, 2005).
Because their auditory processing problems make the oral explanations and examples confusing, students often act as if their math assignments are much too difficult.
One possible reason is that the tools provided by the acquisition and technology community are too difficult to use.
In a sense, this is the classic long-term care admission: Family members have made heroic attempts to care for the patient at home, but the challenges have proven too difficult.
If an RTOS is too difficult to port to customer's proprietary hardware or if the API is unmanageable, evolution will make that RTOS extinct.