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Discover Ludwig"is airtight" is correct and can be used in written English.
It can be used to describe something that is not able to be penetrated or manipulated, or is unlikely to be breached. Example sentence: The security system we installed is airtight and can't be circumvented.
Dictionary
Exact(52)
But no method is airtight.
And talk about structure: "Esplanade" is airtight.
It is airtight and intense, Dwight Garner writes.
The argument is airtight, inescapable, and cunningly faux-naïf.
"But 'Primer' is airtight; the information is in there.
Crowe's script is airtight, his enthusiasm in realizing it is conspicuous, and his messages are irreproachable.
Similar(6)
It was airtight".
Their penalty killing was airtight.
At least we thought it was airtight.
Make sure food wrappings are airtight.
But the sanctions were never assumed to be airtight.
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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