adj.难使无效的；不能废弃的
I have K of p when p is a true belief, and I have good, though not necessarily indefeasible, evidence for p. 强证明可能达到吗？如果不能，这是否是怀疑论的论证？
Any law that violates the indefeasible rights of man is essentially unjust and tyrannical. 凡违反基本人权的法律都是无理和专制的.
It has resolved personal worth into exchange value, and in place of the numberless indefeasible chartered freedoms, has set up that single, unconscionable freedom -- Free Trade. 它把人的尊严变成了交换价值，用一种没有良心的贸易自由代替了无数特许的和自力挣得的自由。
Indefeasible Right of Use Agreement 不可撤销使用权协议
an indefeasible claim; indefeasible rights. 一项不能取消的声明；不能废除的权利
