"is this legitimate?" is a correct and usable part of a sentence in written English.
It can be used when questioning the validity or authenticity of something. For example: - "I received an email from a stranger offering me a large sum of money. Is this legitimate?" - "The company claims to have a 100% satisfaction guarantee. Is this legitimate?" - "He showed me a document that supposedly proves his innocence. Is this legitimate?".
Exact(4)
So is this legitimate trading?
The point is this: legitimate critical analysis distinguishes between whole and part, rather than leveraging one controversial practice to rationalize sweeping proclamations of evil.
Is this legitimate political violence or ultraleft deviationism?
Is this legitimate reporting, to show America lots of Trump's questionable rants against Hillary, delivered in a somewhat more subdued tone than in the past, calling her a liar instead of "Crooked Hillary," while not contrasting it with an equal amount of Hillary Clinton's charges against him?
Similar(56)
This is the legitimate decision.
I'm on the public's side on this one; this is a legitimate gripe.
"This is far beyond the issue of whether this is a legitimate president.
This is a legitimate point.
This is a legitimate question.
This is a legitimate classical artist.
"This is a legitimate business expense".
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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