adjective (a)

• not tractable; difficult to manage or mold(adj.all)

  Example:
  An intractable disposition.
  Intractable pain.
  The most intractable issue of our era.
  Intractable metal.
  

  Antonym:
  manipulable, tractable
  

  source: wordnet30
• Not tractable; not easily governed, managed, or directed; indisposed to be taught, disciplined, or tamed; violent; stubborn; obstinate; refractory; as, an intractable child.(adjective)

  source: webster1913