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Discover LudwigThe phrase "an unknown amount of" is correct and usable in written English.
It can be used when referring to a quantity that is not specified or is uncertain.
Example: "The project requires an unknown amount of resources, making it difficult to estimate the total cost."
Alternatives: "an unspecified quantity of" or "a variable amount of".
Exact(60)
She drove away with an unknown amount of cash.
Wisner also skimmed an unknown amount of money off the Marshall Plan funds for European recovery.
Mr. Browne said an unknown amount of cash was taken from the register.
The robber got away with at least $210,000, plus an unknown amount of night deposits.
But Menczer has always suspected they were missing an unknown amount of more subtle astroturfing campaigns.
"Heatstroke causes organ damage, and that organ damage may persist for an unknown amount of time".
Estimates are that the watch will add about $10bn in revenue, and an unknown amount of profit, during 2015.
The fluorometer is a device which measures an unknown amount of uranium.
Police have confirmed that at least 65 people have been killed and an unknown amount of people remain trapped.
This is most true of household appliances, where the alternative is an unknown amount of labor of a mysterious value.
The explosion wounded Iraqi civilians and caused an unknown amount of property damage (0 killed, 4 wounded).
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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