a.

1. 不可弯曲的；刚硬的
   The new plastic is completely inflexible.

   这种新塑料没有一点儿弹性。

2. 不屈不挠的；坚定的；执拗的[（+in）]
   He was inflexible once he had made a decision.

   他一旦作了决定就不会轻易更改。

3. 不可改变的；不容变更的
   an inflexible rule

   不可改变的规则

adj.

1. unwilling to change; not able to be changed or adapted.
2. not able to be bent; stiff.