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The phrase "an insidious" is correct and usable in written English.
It can be used to describe something that is subtly harmful or deceitful, often in a way that is not immediately obvious.
Example: "The insidious effects of misinformation can spread quickly, undermining trust in reliable sources."
Alternatives: "a treacherous" or "a stealthy".
Exact(60)
It's an insidious thing".
Alzheimer's is an insidious disease.
It is an insidious thing".
This isn't an insidious plot.
Typing is an insidious threat.
This is an insidious tide.
Bladder cancer is an insidious foe.
This, says Malhotra, is an insidious problem.
Salinity is an insidious soil conservation issue.
It's an insidious combination," she declared.
Yet These Associations worked an insidious magic.
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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