If you invented something unique your first problem is going to be describing it to yourself. You'll need new nomenclature. The second problem is describing the unique thing to someone else.
One could argue that anything that can be nailed down by language cannot be unique because the metaphors and phrases to describe it preexisted.
Look if cosmologists have to admit that they lost 95% of the mater in the universe, It shouldn't embarrass philosopher's that they can't define what truth is.