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The phrase "are pernicious" is correct and usable in written English.
It can be used to describe something that is harmful or destructive, often in a subtle or gradual way.
Example: "The rumors circulating in the office are pernicious, as they undermine trust and collaboration among team members."
Alternatives: "are harmful" or "are detrimental".
Dictionary
Exact(33)
The symptoms are pernicious.
And they are pernicious.
These laws are pernicious everywhere.
But, again, the longer-term effects are pernicious.
These are pernicious influences which will eventually completely bring down the ideal of a democracy.
The effects of such actions – presidential demonizing, threats of legal reprisal – are pernicious.
Similar(27)
That is pernicious.
And sentimentality can be pernicious.
Domestic abuse is pernicious.
That inertia is pernicious.
The proposal is pernicious.
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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