The phrase "the deceived" is grammatically correct and usable in written English.
It can be used as a noun phrase to refer to a group of people who have been tricked or misled. For example: - "The deceived were left with nothing but broken promises and empty pockets after the con artist disappeared with their money." - "The deceived were outraged when they discovered that the company had been lying about the safety of their products." - "The deceived felt a sense of betrayal when they found out that their trusted leader had been embezzling funds from the organization."
Dictionary
the deceived
verb
To trick or mislead.
Exact(18)
The play was fast, funny, wordy, and physical, and it sent up deception for the two-way street that it was: an eyes-half-open transaction between the deceiver and the deceived.
Self deception is a bit of a paradox: I am at once the deceiver and the deceived.
While such a technique clearly precludes labeling the film as a documentary, by re-staging events between the deceiver and the deceived Kiarostami implicitly poses questions about the validity and significance of what the audience sees.
Are your bosses the deceived or the deceivers?
The deceivers ended up as the deceived.
As the deceiver, she must believe ~p, and, as the deceived, she must believe p. Accordingly, the self-deceiver consciously believe p and ~p.
Similar(41)
It is commonly known as the "deceptive lactarius", the "deceiving lactarius", or the "deceptive milkcap".
"Putting a pool on the roof was impossible," says Stevenson about the deceiving installation.
"I completely reject the insinuation that the government deceived the public," Mr. Schröder said.
(PwC denies wrongdoing and says the bank deceived the firm).
In some cases, such as host mimicry by parasites, the organism deceived is the model.
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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