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Discover LudwigThe phrase "is no joke" is correct and usable in written English.
You can use it to emphasize that something is not a silly or trivial matter. For example, "Preparing for a marathon is no joke; it requires weeks of intensive training."
Dictionary
is no joke
noun
A form of classical Japanese musical drama.
Exact(58)
"That is no joke.
This is no joke.
Cthulhu is no joke".
But this is no joke.
Coach Smith is no joke".
The relic is no joke.
Being human is no joke.
Sobbing inconsolably is no joke.
The special is no joke.
No, this is no joke.
Humour is no joke in relationships.
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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