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Discover LudwigThe phrase "none the wiser" is correct and commonly used in written English
You can use it when you want to emphasize the fact that someone is unaware of something that they should have known. For example, "After I made my excuses and left the awkward conversation, my friend was none the wiser about my real reason for leaving."
Dictionary
None the wiser
adjective
Not having learned something after a possible opportunity to do so.
Exact(60)
None the wiser.
Still none the wiser.
Incidentally, I am still none the wiser.
The cameraman shrugged, none the wiser.
The world is none the wiser.
I am, frankly, none the wiser.
Heston, less cosmopolitan, was none the wiser.
She exited before me none the wiser.
Really, we are none the wiser.
Despite seemingly endless tests, doctors were none the wiser.
But even then, she was none the wiser.
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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