Undeterminable a. : Not determinable; indeterminable.

Example:
Why might a lab give the result of a chlamydial swab as being Undeterminable?

Taxonomy
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Defination from the web:
undeterminable from the Merriam-Webster Online Dictionary with audio pronunciations, thesaurus, Word of the Day, and word games. ... Learn more about "undeterminable" and related topics at Britannica.com. See a map of "undeterminable" in the Visual Thesaurus. Pronunciation Symbols ...