A dead issue American informal noun slang
Something that no longer matters.
It’s a dead issue. I don't want to argue with you.
A: Are you still angry at drinking too much? B: No, that's a dead issue now.
That is the biggest or most difficult problem (with the situation being discussed)
1. Used to refer to a thing or matter that is insignificant or unimportant
2. Used to refer to a very small amount (of something)
Someone or something is not very skilful, effective, good or remarkable.
If something is not worth a fig, it is not important or considerable.