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Discover LudwigThe phrase "a less efficient" is grammatically correct and can be used in written English.
It is typically used to compare the efficiency of two things, with "less" indicating that one is not as efficient as the other. For example: "The new machine is a less efficient option than the old model, but it is more cost-effective." This sentence compares the efficiency of two machines and states that the new one is not as efficient as the old one.
Exact(60)
Maybe it will be a less efficient owner than the sly oligarchs, though it's not obvious.
The latter species is also a vector, although a less efficient one.
By then communism, for all its tanks and missiles, was plainly a less efficient economic machine.
Most cancer cells, however, use a less efficient mechanism called glycolysis to power themselves.
Similarly, an efficient boiler takes less fuel to heat a home to a given temperature than a less efficient model.
The results compare well with those computed earlier using a less efficient nonlinear code.
In this case it could be desirable to have a less efficient cell if it is significantly lighter.
Sleep deprivation is leading to less efficient learning, higher emotionality, increased anxiety, and a less efficient brain.
It's a less efficient way of finding specific places than an atlas -- not to mention a CD-ROM.
To further limit phytoene pools, a less efficient version of GGPP synthase was employed.
Democratic-leaning voters tend to live in more densely populated areas, making for a less efficient distribution of votes.
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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