Perhaps the complexity of the experience\truth\reality cannot be readily or infinitely reduced to a series of clearer and clearer terminology, but that at a certain arbitrary point, one has to state that certain things are merely unconjecturable.
If we had a machine which could transmit the electrical activity from one brain to another, perhaps this might address the issue because it would be clear that:
Either there is a differing perception (and the origin of your opponent's perception is not something you understand)
You have the same perception but are using different terms because of the ambiguity of language, the non-clarity of language.
The best things in life aren't things.