intractable

Etymology

From in- + tractable.

adj

  1. Not tractable; not able to be managed, controlled, governed or directed.
    And I cannot but expect that this will repeatedly lead to the discovery that an initially intractable problem can be factored after all. 1972, Edsger W. Dijkstra, The Humble Programmer (EWD340)
  2. (mathematics) (of a mathematical problem) Not able to be solved.
  3. (of a problem) Difficult to deal with, solve, or manage.
  4. (of a person) Stubborn; obstinate.
  5. (medicine) Difficult to treat (of a medical condition).

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