Unproven

The Riemann Hypothesis is unproven.

His conclusions are based on unproven assumptions.

Such claims are unproven.

Critics say the technology is unproven.

If a hotelier touts an unproven or dangerous medicine, or if a film actor sells polished stones or scented candles with purported health benefits, these are examples of a kind of informal fallacy called an "appeal to authority".

This is an unproven hypothesis.

This hypothesis is unproven.

Near-synonyms: unconfirmed; see also Thesaurus:baseless

Furthermore, the system is not entirely unproven.