[OhMeadhbh]

I think this is for a different domain than software engineering, but it describes the basics, mostly difficult to get consensus on detailed requirements, often due to "personal" or "group political" reasons.

https://en.wikipedia.org/wiki/Wicked_problem

I sometimes use the term to describe heisenbugs, which is probably incorrect.

https://en.wikipedia.org/wiki/Heisenbug