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Discover LudwigThe phrase "are not robust" is correct and usable in written English.
It can be used to describe something that lacks strength, stability, or effectiveness in various contexts, such as technology, systems, or arguments.
Example: "The current security measures are not robust enough to protect against advanced cyber threats."
Alternatives: "are not strong" or "are not reliable."
Dictionary
Exact(60)
While Fuzzles are ferocious, they are not robust: mine generally die in the midst of battle.
At the presidential level, these are not robust times for third parties.
If systems are not robust enough, then the Home Office should urgently address this.
"We don't have a very solid set of analytical inputs, and the projections are not robust," Dubash said.
Thailand has scandalously strict lèse-majesté laws, but even these, apparently, are not robust enough for the RCO.
Yet developing countries are not robust enough to keep the global economy from sinking in a morass for long.
While the forecasts of economic growth for the United States are not robust, those for Europe and Japan are still weaker.
Usually they are the elderly and the very young, people whose immune systems are not robust enough to fight off the virus.
On the ground, however, it seems clear that regional missions are not robust enough to protect the many thousands of civilians already in distress.
These algorithms are not robust.
Corporate earnings are not robust, to say the least.
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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