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"useless knowledge" is correct and usable in written English.
You can use it to describe knowledge that may be interesting but has no practical application. For example, "He had amassed a vast amount of useless knowledge, such as the names of all the kings of England."
Exact(36)
It is not useless knowledge.
There's no such thing as useless knowledge, not if it bring someone pleasure and fulfilment.
Because, he tells his friend Pollard, it is "useless knowledge for its own sake".
I was always a fount of useless knowledge about Brooklyn; now it's not so useless.
I will go over various examples in history to argue for the usefulness of "useless" knowledge.
But most of all, it supports the theory that there really is no such thing as "useless" knowledge.
Similar(24)
The stockpile of useless general knowledge kicking around our brains that hasn't been tapped for some quiz or other is depleted, and the novelty of reading about bridges, medieval armour, binary etc is wearing off.
We extracted so much oil and water that we completely changed the subsurface dynamics of the San Andreas fault system and rendered useless our knowledge of the previous earthquake frequency.
But they are useless without specialist knowledge.
So it was with some dismay that he found his hard-earned knowledge useless when he fought a parking ticket before the Village Court of Great Neck Plaza last month.
Yet the conclusion leaves no doubt about Johnson's ultimate judgment: "negligence and irregularity, long continued, will make knowledge useless, wit ridiculous, and genius contemptible".
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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