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The word "insanity" is correct and usable in written English
You can use it to talk about someone or something that is very irrational, erratic, and potentially dangerous, as in the following sentence: "The villain's insanity was what ultimately led to his downfall."
Dictionary
insanity
noun
The state of being insane; madness.
Exact(60)
It is an on-spec life and it is full of what can only be described as insane serendipity (or serendipitous insanity)."~ Richard Morgan, "Seven Years as a Freelance Writer, or, How To Make Vitamin Soup" (Awl).
But it is also a hugely celebratory collective insanity, a world away from the portentousness and individualism of much current hip-hop and rock.
But Routh still knew right from wrong, Starnes added, and his illness did not rise to the level of "severe mental disease or defect" at the time of the crime – the legal definition to meet the insanity standard in Texas.
Last month, Orban, who has ruled Hungary since 2010, described the EU's quotas for taking in asylum-seekers as "bordering on insanity".
Routh is pleading not guilty by reason of insanity.
Albert Einstein said that the definition of insanity is doing the same thing over and over again and expecting a different result.
Six months after graduating and with the first signs of unemployment-related insanity taking hold I have enthusiastically returned to the world of temping.
It would be the height of insanity to use the proceeds of council house sales in London to help build more homes away from London, because is it is London where we have a housing crisis.
Ed Sheeran has already been voted the most powerful figure in UK black music by 1Xtra itself – and while you're allowed to dismiss that as insanity, there's no denying that he acts as a middleman to some, introducing his pop fanbase to grime stars such as Wiley.
Of course, in Hogarth's view, the boundary between sanity and insanity is not that obvious at all.
And despite the insanity of this episode, it did make me realise that it was quite simple pleasures that make me happy in life: good conversations, meals shared with interesting people and working at a job I believe in.
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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