"Unsolved questions" refers to unanswered or unresolved issues or problems that have not yet been figured out or solved.
Sentences with «unsolved questions»
This is Hamlet without the prince: finance and representation are the big unsolved questions in UK devolution. (blog.politics.ox.ac.uk)
Aion is a third generation blockchain network designed to address unsolved questions of scalability, privacy, and interoperability in blockchain networks. (blockchainafrica.co)