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 _______.
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.
You can borrow the term for unsolvable mathematical problems which are said to be intractable
Not able to be solved (of a mathematical problem)