There's already unambiguous, well-defined languages, at least if formal logic can be described as a "language."
It's "There are". (hehehehe sorry -imperfect language humor)
True -there are aspects of any language which would still exist in such a pure language -and languages we develop for specific purposes can be pure -even perfect for those purposes -(programming codes/languages, etc..).
The pure language spoken of in the bible would be a universal, spoken/written, etc.. language, however -its main function would be allowing all to serve God with one consent.
It would also originate from God's perspective -which is a complete perspective.
Even scientists find that their languages need to be altered as their understanding increases -and due to the creation of words and phrases based on imperfect perception, words often change meaning or are discarded as they are found to represent nothing true.
Such a pure language might include vast amounts of knowledge -words for things and concepts we have yet to imagine -but the principles thereof might also allow for learning at a much faster rate -without possibility of misunderstanding.
We develop languages as we go. Altering and expanding these languages actually slows progress -whereas a pure language given by one who created all that we can know (apart from what we create) -and who knows that our purpose is to create infinitely -might allow us to go where we can much faster and with greater ease -and create more efficiently.
This is even more true due to its universality. No more translating -no more languages which cannot be directly translated, etc...
No more of one person saying one thing and all present misunderstanding, etc....