irreproducible
Definitions
Impossible to reproduce, duplicate, or replicate.
Relating to scientific results that cannot be obtained again by independent researchers using the same methods.
Examples
The scientist was unable to publish her findings because the experiment proved to be irreproducible in subsequent trials.
Many critics argued that the study's results were irreproducible due to the lack of a standardized methodology.
The rare phenomenon observed in the laboratory was unfortunately irreproducible, leaving researchers with more questions than answers.