What does nubious mean?

"Nubious" is not a real word in the English language. It's likely a misspelling of "noxious" or "nebulous".

Here's the difference:

* Noxious: Harmful or poisonous.

* Nebulous: Vague, unclear, or indistinct.

If you can provide more context about where you encountered this word, I might be able to help you figure out what it was meant to be.