The phrase "arguably foremost" is correct and usable in written English.
It can be used when discussing a subject or person that is considered to be the most important or prominent in a particular context, while acknowledging that this is a matter of opinion.
Example: "In the field of modern literature, she is arguably foremost among contemporary authors."
Alternatives: "possibly the leading" or "potentially the top".
And given that Impressionism, the world's most popular art movement, is arguably foremost an art of the city, the country and the riverbank, this show hails from an unexpected realm, that of Neptune.
Clocking in at nearly 1,700 pages, including 70 just for the footnotes, this tome has been hailed as "magisterial" and is already being held up as the standard reference work on Christianity's first and, arguably foremost, theologian.
While this radiation is fascinating in its own right, Peromyscus is arguably foremost among nascent model systems that may aptly model the genetic complexity of the human condition, which too has long been shaped by natural selection in the wild.
And I haven't even mentioned the actor who is arguably the foremost American Shakespearean actor working today: Liev Schreiber.
Her pointed sarcasm is one reason she became arguably the foremost female interpreter of Randy Newman; regrettably, she performed none of his songs on Tuesday.
His patron, Ayatollah Kazem al-Haeri, still lives in the Iranian city of Qum, arguably the foremost seat of Shiite theocratic learning.
Thile is now arguably the foremost mandolin player in the world, a core member of Yo-Yo Ma's Goat Rodeo Sessions and founder of the Punch Brothers.
Built in 1917, the six-story Ford Building was designed by Albert Kahn, arguably the foremost American industrial architect of the 20th century.
As "Alexander Hamilton" makes clear, the lawyer, battlefield hero and treasury secretary who was "arguably the foremost political pamphleteer in American history," never met a subject unworthy of polemicism or a controversy he didn't like.
It is a dish that, in its ideal form is, arguably, our foremost comfort food – but one that, due its lack of a rigorous, specific format is open to all sorts of haphazard misinterpretation.
Arguably the foremost of the New Wave film-makers, Truffaut was also the first to go: killed by a brain tumour at the age of 52 after a life spent in perpetual motion.
