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Discover LudwigThe phrase "a mysterious variable" is correct and usable in written English.
You can use it when referring to an unknown or unclear factor that may influence a situation or outcome, often in contexts like science, mathematics, or storytelling.
Example: "In the experiment, we encountered a mysterious variable that affected our results in unexpected ways."
Alternatives: "an enigmatic factor" or "an unknown element".
Exact(1)
Human behavior remains a mysterious variable.
Similar(59)
The former is how algebra courses currently proceed — introducing the mysterious variable x, which many students struggle to understand.
It is impossible, truly, to know, but the mysterious variables at play out there keep you awake at night.
The academic evidence on city size and growth rates is ambiguous because there are many complexities; agglomeration itself is a mysterious and alchemical process between underspecified variables.
Pumatrac: The free iPhone running app tracks and audibly informs you of your distance traveled, speed, calories burned and weather, ultimately producing a real-time map, elevation profile of your route and an overall score for the workout (arrived at by a mysterious algorithm that combines all the variables).
Have a mysterious rash?
Creativity has long been seen as a mysterious process.
A mysterious radiance from within.
Blavatnik was a mysterious buyer.
Amber is a mysterious ingredient.
ACTING is a mysterious craft.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com