"the innocent" is a correct and usable phrase in written English.
It can be used in a variety of contexts and has different meanings depending on the sentence it is used in. One possible example of using "the innocent" in a sentence is: "The innocent are often the ones who suffer the most in times of war." (meaning: those who are not involved or responsible for the conflict) In this sentence, "the innocent" refers to a specific group of people who are affected by war, highlighting their vulnerability and lack of culpability.
Dictionary
the innocent
adjective
Free from guilt, sin, or immorality.
Exact(60)
Deceiver of the innocent!
To protect the innocent?
"We are the innocent parties".
Full of the innocent fruit.
Treat the innocent like the innocent".
"The innocent deserve protection".
And the innocent hunted.
Why the innocent lives?
"The innocent always pay the bill".
But the innocent, too, are victims.
Full of the innocent fruit Are Dangerous.
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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