Source : Webster's Revised Unabridged Dictionary (1913)

Intractability \In*tract`a*bil"i*ty\, n.
   The quality of being intractable; intractableness. --Bp.
   Hurd.

Source : WordNet®

intractability
     n : the trait of being hard to influence or control [syn: {intractableness}]
         [ant: {tractability}]