What does unreproducible mean?
Unreproducible is an adjective for something that cannot be repeated with the same result or outcome. It is especially common in technical and scientific discussion, where an experiment, finding, software defect, or observation may be described as unreproducible when another attempt does not match the original. The word can also describe an event or process that, by its nature, cannot be recreated exactly. In such contexts, it suggests more than simple inconvenience: it raises questions about reliability, consistency, or whether the original claim was sound. The adjective is related to reproducible, meaning capable of being duplicated or confirmed by repetition, and to reproduce, meaning to bring something about again. Although reproducible often carries a positive evaluative implication in research, unreproducible is correspondingly negative, highlighting instability or lack of confirmation. It is a useful word when a result must be distinguished from a one-off anomaly or an event that was inherently unique.
adjectiveUnable to be reproduced; not producing the same result, behaviour, or outcome when an experiment, process, or event is repeated.
- Unable to be reproduced with the same result or outcome.
"The researchers could not determine why the system failure was unreproducible."
"The team spent days investigating the unreproducible software crash."
"The study's central claim was based on an unreproducible experimental result."
A result that cannot be reproduced cannot be independently checked—and that is why the word sits at the heart of science's reproducibility crisis.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does unreproducible come from?
Unreproducible was formed in English by adding the prefix un- to reproducible, which combines reproduce with the suffix -ible. The verb reproduce comes from Latin reproducere, formed from re-, meaning “again,” and producere, meaning “bring forth” or “produce.” The same Latin root underlies cognates such as production, productive, and product.
How unreproducible is actually used
Mostly formal and technical, especially in scientific research, software development, and engineering. It can also describe an event or process that is inherently impossible to recreate exactly.
Easily confused with unreproducible
Irreproducible is a near-synonym meaning “not reproducible”; the choice is mainly stylistic, as both adjectives can describe results, findings, or behaviour.