Dictionary
unknown unknowns
noun
Plural of unknown
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The phrase "unknown unknowns" is a correct and usable part of a sentence in written English.
It can be used to refer to things that are not only unknown, but also unexpected or not even considered. Example: "When conducting market research, it's important to be aware of not only the known unknowns, but also the unknown unknowns – the potential factors that we may not even be aware of yet."
Exact(60)
– unknown unknowns.
There are unknown unknowns".
It is all unknown unknowns.
We have a lot of unknown unknowns".
But there are also unknown unknowns.
Subjective uncertainty is about the "unknown unknowns".
Markets are fraught with "unknown unknowns".
Twenty years later, we swim in unknown unknowns.
The challenge is figuring out the unknown unknowns.
And as for the unknown unknowns - well, who knows?
"We're on the same team — looking for the unknown unknowns".
Related(20)
unknown strangers
unknown men
unknown gunmen
unknown things
unknown assailants
unknown questions
alien aliens
unlimited unlimiteds
unknown variables
unknown masked
unknown unidentified
unknown people
unknown Dimensions
unknown women
unknown quantities
unknown modifications
unknown shrinks
unknown vandals
unknown pathways
unknown thousands
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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