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Discover LudwigThe phrase "is chiefly" is grammatically correct and can be used in written English
It is commonly used to indicate that something is primarily or mainly responsible for a certain outcome or quality. Example: The success of the company's marketing strategy is chiefly due to their innovative use of social media.
Dictionary
is chiefly
adverb
Especially or primarily; above all
Exact(58)
Elias is chiefly wilderness.
But the vibe is chiefly anarchist.
The thorax is chiefly concerned with locomotion.
Who is chiefly to blame?
To Mr. Talarico, the battle is chiefly about ideology.
Iridium is chiefly used in the form of platinum alloys.
Of course this difference is chiefly by design.
The responsibility for undoing the debacle is chiefly American, too.
What happens next is chiefly up to the virus.
The community is chiefly young, male and extremely wired.
That is chiefly because many officials were corrupt and obstructive.
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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