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Discover Ludwig"mortal sin" is a correct and usable term in written English.
Generally, it is used within a religious context to refer to a type of sin that is considered to be particularly egregious. For example, "The priest said that lying was a mortal sin and that confession was the only way for it to be forgiven."
Dictionary
mortal sin
noun
(Roman Catholic theology) a mortal sin is a grave matter, such as murder or blasphemy, and is committed with the full knowledge and deliberate consent of the sinner. The committing of such a heinous sin causes a complete loss of grace and leads to eternal damnation unless absolved.
Exact(60)
It's a mortal sin".
Faithlessness was the mortal sin.
So what is a mortal sin?
Hypocrisy alone is no mortal sin.
But ours is not a mortal sin.
Double denim is a mortal sin.
And that is bad, very bad — a mortal sin.
That's how come they call it a mortal sin.
It has indeed almost the status of a mortal sin".
Centuries of Catholic teaching hold suicide as a mortal sin.
Declaring suicide a mortal sin was the Church's solution.
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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