irradicable

有些偏见在该地区根深蒂固，难以根除。

Some prejudices are so deeply rooted in this region that they seem ___irradicable.

科学家警告说，这种病毒一旦进入野生种群，就可能无法根除。

Scientists warn that once the virus enters wild populations, it may become ___irradicable.

那种错误的观念在他的脑海中根深蒂固，无法消除。

That false belief is so fixed in his mind that it is virtually ___irradicable.