intractable
/ɪnˈtɹæk.tə.bəl/ adjective C2- Not tractable; not able to be managed, controlled, governed or directed.
- Not able to be solved in polynomial time; too difficult to attempt to solve.
- Difficult to deal with, solve, or manage. (of a problem)
- Stubborn; obstinate. (of a person)
- Difficult to treat (of a medical condition).
From the library
He was, too, very learned, and rational enough on all points which did not relate to his treasure; but on that, indeed, he was intractable.”
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