nie do obrony in English:

refusal to negotiate a date for an independence referendum is untenable

1 : not able to be defended - an untenable position 2 : not able to be occupied - untenable apartments

If she decided against relocation, her DRO would promptly drop her, since by deciding to live in close proximity with a rogue man, she was exposing herself to an untenable amount of danger (and so the DRO to a high risk for financial loss!).

I think his sarcastic comments are completely indefensible.

The war is morally indefensible. His opinions/attitudes are completely indefensible.