inexpugnable

Therefore the mind which is free from passions is a citadel, for man has nothing more secure to which he can fly for, refuge and for the future be inexpugnable.

所以，那摆脱了激情的心灵就是一座堡垒，因为人再没有什么比这更安全的。

inexpugnable position

难以推翻的立场

inexpugnable dislike.

驱之不去的厌恶

inexpugnable

adj. 不能攻占的, 不能驳倒的