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"unsatisfactory rate" is a correct and usable phrase in written English
You can use it when referring to the rate of something that is not up to an expected level. For example, "The unsatisfactory rate of customer service in the restaurant was a cause for concern."
Exact(24)
"Languages have a most unsatisfactory rate of diversity," says Martin Durrell, head of German at Manchester University.
However, the unsatisfactory rate performance of NiCo2O4 may prove to be a major hurdle to its commercial usage.
As promising cathode materials in Li-ion batteries, Li-rich layered oxides still suffer from unsatisfactory rate capability and cyclic stability during cycling.
Unsatisfactory rate of cervical cytology smears.
The pooled unsatisfactory rate (weighted average) was 0.3%.
The unsatisfactory rate for colposcopy was high (21%).
Similar(27)
Ms. Herman refused to give Ms. McGovern the unsatisfactory rating.
Under official guidelines, Siemens should have received an unsatisfactory rating.
Under the teachers' union contract, an unsatisfactory rating is the first step toward dismissing a teacher.
ButterflyPhoto, the largest of these sites, has an unsatisfactory rating from the New York Better Business Bureau.
The carrier was given an unsatisfactory rating and banned from making interstate trips.
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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