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"not previously known" is correct and usable in written English.
You can use this phrase to describe something that nobody was aware of before. For example: "The cause of the accident was something not previously known."
Exact(60)
He was not previously known to police.
These features were not previously known.
These two networks were not previously known to be isomorphic.
Ready, in particular, for something I'd not previously known about.
"There were not previously known ways to make this happen," says MacMillan.
But the precise number and the exact nature of the interrogation method was not previously known.
The latter, which were not previously known to exist in Sinai, caused military analysts significant alarm.
However, it was reported that there are names not previously known to the intelligence services.
It was not previously known that the car had been in Gulfport, Miss.
Mr. Baum said prosecutors told his client that they had not previously known about the book.
For example, white-footed mice, not previously known to inhabit Central Park, are actually superabundant there.
More suggestions(15)
not before known
not previously learned
not previously appreciated
not historically known
not currently known
not previously recognized
not initially known
not hitherto known
not previously well known
not previously familiar
not previously employed
not previously conducted
not yet known
not ever known
not previously taken
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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