intractable

adj.

难对付的，难管教的，倔强的；难加工的；难治疗的；

1. We are facing an intractable problem.
   我们面临着一个难以解决的问题。
2. I'm an intractable person and I will untiringly do what I want to do.
   我是一个倔强的人，我想做的事情我一定会坚持不懈努力到底的。
3. You'd better not use the intractable materials.
   你最好不要用这些不易加工的材料。
4. The doctor told him that it was intractable pain.
   医生告诉他这是难治疗的疼痛。

Intractable Epilepsy: Definition and Neurobiology
Predictors of Intractable Epilepsy in Childhood: A Case-Control Study
Chronic anterior thalamus stimulation for intractable epilepsy
Frame Reflection: Toward the Resolution of Intractable Policy Controversies
Frame reflection : toward the resolution of intractable policy controversies
Digital signatures and public-key functions as intractable as factorization
DIGITALIZED SIGNATURES AND PUBLIC-KEY FUNCTIONS AS INTRACTABLE AS FACTORIZATION
MDR1 gene expression in brain of patients with medically intractable epilepsy
A nonsense mutation of the sodium channel gene SCN2A in a patient with intractable epilepsy and mental decline
Electrical stimulation of the anterior nucleus of the thalamus for the treatment of intractable epilepsy