What does undeterminable mean?
Undeterminable is a formal adjective describing something that cannot be determined with the available evidence or by any reliable method. It is often applied to causes, origins, quantities, outcomes, and timelines, especially when further investigation cannot establish a definite answer. Unlike simply unknown, which may mean that a fact has not yet been discovered, undeterminable suggests that the evidence or underlying conditions make a conclusive determination impossible. The word can apply to a precise value, such as an amount that cannot be calculated, or to a question of causation, such as whether a disputed effect was caused by a particular event. In ordinary discussion, synonyms such as indeterminable, uncertain, and unclear may sound more accessible, but they do not always convey the same emphasis. Undeterminable is especially common in technical, legal, scientific, and historical prose, where it marks the limits of what can be established rather than merely what the writer happens to know. Its value lies in making that distinction explicit: not merely unanswered, but apparently unanswerable on the available basis.
adjectiveUnable to be determined or established with certainty, especially because the available evidence or circumstances do not permit a conclusive conclusion.
- Unable to be determined or established with certainty.
"The precise cause of the discrepancy remains undeterminable from the surviving records."
"The precise cause of the discrepancy remains undeterminable from the surviving records."
"Without the original sample, the contamination timeline is undeterminable."
Add un- to determinable, and certainty develops an exit: some questions cannot be closed even by the best available evidence.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does undeterminable come from?
The English adjective was formed by adding the negative prefix un-, meaning “not,” to determinable. The underlying Latin foundation is determinare, “to set bounds, limit, or determine,” which is related to terminus, “boundary.” The modern word thus literally conveys the idea of being unable to have something determined or defined conclusively.
Related word forms
How undeterminable is actually used
This is a formal word common in scientific, legal, technical, and historical prose. It often implies that a conclusive determination may be impossible rather than merely that the relevant information has not yet been discovered.
Easily confused with undeterminable
Both words mean that something cannot be determined, but indeterminable is a less common synonymous form, whereas undeterminable is the standard contemporary choice.