Word for a topic with an unreachable conclusion

What would I call a topic or question with an unreachable (or almost so) conclusion? Example:

It is difficult to write a paper about the meaning of life because the topic is so _______.

or:

Political discussions at the Thanksgiving table are ________.

A similar term is a metaphysical question, but I am looking for a word/short phrase that more conveys the unlikelihood of coming to a definitive answer/conclusion. I searched Google and came up with nothing.

Answer

You can borrow the term for unsolvable mathematical problems which are said to be intractable

Not able to be solved (of a mathematical problem)

Wiktionary

Attribution
Source : Link , Question Author : OldBunny2800 , Answer Author : Dan

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