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Discover LudwigThe phrase "not proper" is grammatically correct and is commonly used in written English.
It is typically used to describe something that is considered improper or inappropriate. Example: The use of slang and informal language is not proper in formal academic writing. In this sentence, "not proper" is used to indicate that using slang and informal language goes against the expected or proper style in academic writing.
Exact(56)
They're not proper jokes".
That's not proper cooking.
Not proper cricket?
It's just not proper protocol.
Friend or foe, it's not proper".
Not proper lies, just little lies.
'It's not proper,' Shi Guifang said softly.
We believe we're not proper adults.
"That's just not legal, not proper".
Similar(2)
Along the way to my ideal not-proper job, I spent 10 years or so piecing together a living with other not-proper jobs.
"Putting them behind walls is not proper care".
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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