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'is primarily responsible' is correct and usable in written English.
You can use it to describe someone or something that has the main or primary responsibility for something. For example: The manager of the project is primarily responsible for its success.
Dictionary
is primarily responsible
adverb
Of a primary or central nature, first and foremost
Exact(59)
The response from South Sudan's government, which is primarily responsible for freeing the boys, has also been tepid.
"Netanyahu is primarily responsible".
Who is primarily responsible for Mrs. X's death?
"Every country is primarily responsible for its own development outcomes," the document insists.
But there is little doubt who he thinks is primarily responsible for the friction.
In the eyes of most Chinese, the 75-year-old is primarily responsible.
Eugene Robinson, an assistant managing editor who is primarily responsible for the Style section, shepherded the article.
The White House claims that the economic slowdown is primarily responsible for these deficits are wearing thin.
"The expectation that the mother is primarily responsible for the children and family home disfigures our relationships," Asher writes.
Just as in 2008, the war in Somalia is primarily responsible for the worst that is happening.
As he correctly notes, it is China that is primarily responsible for setting this game in motion.
More suggestions(16)
is mostly responsible
is chiefly responsible
is substantially responsible
is essentially responsible
is basically responsible
is generally responsible
is especially responsible
is particularly responsible
is fundamentally responsible
is notably responsible
is largely responsible
is crucially responsible
is primarily accountable
is principally responsible
is specifically responsible
is originally responsible
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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