Yes, unless we stretch the definition of conscious most people use beyond recognition.

At that point, though, it will be so remote from what we use the term for, that it could just be any random term, like doskoulard!

"Can we even refutre that a rock is doskoulard?"

The rock is neither "aware" nor "responsive". It just stands there. It's a non-reactive set of minerals, lacking not just any capacity to react, but also life.

Though that's overthinking it. Sometimes you don't need decicated testing equipment to know something, just common sense.

Common sense is valuable, but it has a mixed scientific track record.

You can always find small exceptions to everything. But you know what I mean.

Except if your point is that, like the vegetative victims, the rock's brain is still alive.