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The phrase "a kind of unknown" is correct and usable in written English.
It can be used to describe something that is not fully understood or is mysterious in nature.
Example: "The phenomenon presented a kind of unknown that intrigued the researchers, prompting them to investigate further."
Alternatives: "a sort of mystery" or "a type of enigma".
Exact(2)
Weinberg was a kind of unknown passenger on the ship of the twentieth century — a man who withdrew increasingly into a private musical world.
Based on the reduced-order observer, we provide a kind of unknown information estimating method which can be used to not only reconstruct the actuator faults but also estimate the disturbances of the system.
Similar(57)
It's all kind of unknown at this point".
Perhaps more important, state insurance regulators provide a kind of oversight unknown in the world of public pensions.
Tens of protesters had turned into hundreds, then thousands, as the Egyptian street began to boil with a kind of intensity unknown during the time of Hosni Mubarak, the ailing pharaoh of a once-great but now stagnating Arab power.
He suggests that power derives mainly from a kind of honesty unknown to us today — heard in the unpolished prose of Civil War soldiers or seen in the wrenching photographs of the war's dead.
The digital equivalents of the ancient Quran and King James Bible copy are the kind of "unknown unknowns" that may escape the embedded biases of a search engine.
"The Four Seasons" shows that the company has a kind of speed still unknown in British dancers.
The show is a kind of spiritual "Parts Unknown," in which religions are ingested like sea-urchin roe — but without Anthony Bourdain's lovable loutishness.
The people out there who have been misidentified as being "vegetative" suffer a kind of solitary confinement unknown to prisoners of war.
There were all kinds of unknown things that could come out in a photograph, things you didn't know were there until you saw it; now it's all so flat.
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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