always /ɪnˈver.i.ə.bli/

This acute infection of the brain is almost invariably fatal.
这种急性大脑传染病几乎总是导致死亡。

This is not invariably the case.
事情并非总是如此。

Invariably the reply came back, ‘Not now!’
答复无例外地又是:“现在不行!”