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Discover LudwigThe phrase "not valid" is correct and can be used in written English.
It is typically used to describe something that is not acceptable or legally binding. Here is an example: "The contract was not valid because it was not signed by both parties."
Exact(60)
Not valid online.
That command is not valid".
These are not valid motives.
"They're not valid at other locations".
"If it has, it's not valid".
Offer is not valid in outlet stores.
"Perhaps they are not valid any more".
"Alex's perceived transcontinental record is not valid.
"They are not valid," he said.
Recent campaigns are not valid comparisons.
"Not valid ID, for driving purposes only.
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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