a.

1. 执拗的
2. 有抵抗力的
3. 难治的
4. 耐火的

n.

1. 耐火物质；（常复数）耐火砖
2. 倔强的人

adj.

1. stubborn or unmanageable.
2. resistant to a process or stimulus.
   ▸Medicine  not yielding to treatment.
   ▸technical heat-resistant; hard to melt or fuse.

n.