1. not capable of being demonstrated, proved, or shown to be true
Usage: formal; often used in philosophical or logical contexts

Examples

• The existence of God remains indemonstrable through scientific methods alone.
• Some philosophers argue that certain axioms are indemonstrable yet necessary for logical systems.
• Her claim was indemonstrable because no empirical evidence could support it.
• The theory rested on indemonstrable assumptions that critics questioned.
• While the hypothesis seemed plausible, it was ultimately indemonstrable in the laboratory.