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Discover LudwigThe phrase "is very rigorous" is correct and usable in written English.
You can use it to describe an activity which requires persistence and a great amount of effort. For example: "The training program for upcoming marathon runners is very rigorous."
Exact(14)
Chris is very rigorous.
The Usada and IAAF TUE process is very rigorous.
Schooling is very rigorous in Japan, so studying something deeply comes easily.
"She is very rigorous and there is challenge, there is pressure.
And that constant tyranny, because it is a tyranny, of a conscience that is very rigorous and very Catholic.
"There are people who do, but they leave in ten minutes because the life is very rigorous.
Similar(46)
He was very rigorous.
We were very rigorous about that".
"It's very rigorous," Mr. Matluk said.
"We've been very rigorous," Mr. LaRocco said.
He told me, "I am very rigorous with myself.
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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