How to Use undecidable in a Sentence

undecidable

adjective

• It was found to be undecidable using the standard axioms of mathematics.
  — Quanta Magazine, 18 May 2026
• One may argue that a more fundamental theory (with more complete axioms) could decide the question, but the final theory should not have undecidable statements.
  — Quanta Magazine, 18 May 2026
• Because the halting problem is generally undecidable, however, this also applies to the solvability of a Super Mario level.
  — Manon Bischoff, Scientific American, 6 Oct. 2026
• Among the most important undecidable statements is the continuum hypothesis (CH), proved to be undecidable in the Gödelian sense by Paul Cohen in 1963.
  — Quanta Magazine, 18 May 2026
• In 2015 a team that included physicist Toby Cubitt of University College London demonstrated that the general problem of determining a mass gap is likely undecidable.
  — Manon Bischoff, Scientific American, 15 Sep. 2026