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Discover LudwigThe phrase "are lethal" is correct and usable in written English.
It can be used to describe something that is capable of causing death or serious harm.
Example: "Certain chemicals are lethal if ingested in large quantities."
Alternatives: "are deadly" or "are fatal".
Dictionary
are lethal
adjective
Deadly; mortal; fatal.
synonyms
Exact(60)
Leadoff walks are lethal.
Abused, they are lethal.
On the break they are lethal.
But Hezbollah's conventional rockets are lethal enough.
But these toxins are lethal only to leaf-eating bollworms.
Talk may be cheap, but its consequences are lethal.
Some are lethal, while others do not require treatment.
Some insecticides are lethal, while others are not.
Others, notably cadmium, are lethal to the touch.
Approximately 60% of the cases of ovarian cancer are lethal.
The cytokines, which cause a useful inflammatory response in small doses, are lethal en masse.
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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