1. impossible or impractical to test or verify

Examples

• The theory was criticized for making untestable predictions.
• His hypothesis about ancient civilizations remains untestable with current technology.
• The software contained untestable code that couldn’t be properly evaluated.
• Many philosophical claims are untestable by scientific methods.
• The researcher avoided making untestable assumptions in her study.
• Some aspects of quantum mechanics seem untestable in practice.