1. impossible to prove or demonstrate as true

Examples

• The existence of parallel universes remains unprovable with current technology.
• His theory was interesting but ultimately unprovable.
• Many philosophical questions are unprovable by scientific methods.
• The defendant’s alibi was unprovable due to lack of witnesses.
• Some mathematical conjectures may be unprovable within certain systems.
• Her claim about the company’s practices was unprovable without documentation.