unprovenadjective
/ʌnˈpruː.vən/not having been shown to be good enough or to be able to do something:
It would be unwise to throw billions at unproven technology.
a group of talented but unproven young players
not having been shown to be true:
Unproven allegations have ruined his career.
The suspicion, as yet unproven in court, is that he may have withheld important information.