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The phrase "relatively inefficient" is correct and can be used in written English.
You can use this phrase to make a comparison between two things or in situations when something is not very effective but could be worse. For example: "The electric car is relatively inefficient compared to the traditional gasoline engine."
Exact(60)
Historically, solar energy harvesting has been expensive and relatively inefficient.
The prototype solar cell is still relatively inefficient.
As killing machines, smoothbore infantry muskets were relatively inefficient.
"Relatively inefficient but ingenious" is how one analyst described the mobile factories.
OLED lighting blends red, green, and blue light, but the blue light is relatively inefficient.
But burning wood to produce electricity is a relatively inefficient process.
The "thin film" photovoltaic cells this produces are relatively inefficient at converting solar radiation into electricity.
Repeated online solicitations for small donations are a relatively inefficient way of raising money.
Most acids and alkalis either are too caustic to tissues or are relatively inefficient bactericides.
Traditional PCA-based methods, nevertheless, often are relatively inefficient at detecting incipient anomalies.
One result of these assumptions is that pbrt is relatively inefficient at rendering simple images.
More suggestions(15)
relatively unprofitable
relatively deficient
relatively effective
relatively inept
relatively incompetent
relatively unsuccessful
relatively poor
relatively weak
relatively insufficient
relatively inadequate
relatively ineffectual
relatively unproductive
reasonably inefficient
relatively toothless
found inefficient
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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