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Discover LudwigThe phrase "less effective at" is correct and usable in written English.
You can use it to compare the effectiveness of different methods, strategies, or actions in achieving a particular goal.
Example: "The new marketing strategy is less effective at reaching our target audience than the previous one."
Alternatives: "not as effective in" or "more ineffective at".
Exact(59)
They were also less effective at note taking.
It is less effective at blocking out colleagues or people talking on the street.
The hackers are typically based overseas where authorities are less effective at preventing them.
And larger particles in LDL appear to be less effective at causing it.
Cold-raised bees also were found to be less effective at learning to recognize flowerlike odors.
And it didn't take long for them to become less effective at killing weeds.
But Coburn observed that "no group was less effective at accumulating influence" than the NGO community.
Dr. Constantine cited company-financed research indicating that women often feel less effective at work and school during their periods.
Citing company-backed studies, she reported that menstruating women feel less effective at work and take more sick days.
Macro lenses provide their best results at close range and are less effective at distances common in conventional photography.
Somewhat less effective at reducing vertebral fractures is calcitonin, a naturally occurring hormone sold as Fortical and Miacalcin.
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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