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The phrase "an outdated idea" is correct and usable in written English.
You can use it to describe a concept or belief that is no longer relevant or accepted in contemporary discussions.
Example: "The notion that the Earth is flat is an outdated idea that has been debunked by centuries of scientific evidence."
Alternatives: "an obsolete concept" or "a dated belief".
Exact(21)
"Sciascia was an adorable person, but he had an outdated idea of the mafia," Battaglia says.
"I really question Adrian's idea that committing to a building is an outdated idea," he said.
Is "housewife" a dirty word, an outdated idea or an accurate job description?
If we are to believe what has been written about the Camp David talks, they collapsed not because of an outdated idea of holiness, but rather an outdated idea of sovereignty.
Know your benefits.Many pre-retirees have an outdated idea of how much they'll have in pension income and how much health care will cost.
Tim Brown, C.E.O. and president, IDEO Bill put collaboration at the heart of design, realizing that the all-powerful individual designer was an outdated idea.
Similar(39)
A call for energy independence, when the Middle Eastern monopoly on oil has been over for decades, is like the wall with Mexico--a deeply outdated idea that has no basis in reality.
The idea that we need highly trained veteran journalists to tell us what is happening strikes me as an increasingly outdated idea," insists Stephens, author of A History of News.
It's a very outdated idea".
"A lot of people who are 30, 40 or 50 probably have a fairly outdated idea of what orthodontics is and they probably go back to a time when it was literally a mouthful," said George Clark, a co-founder of Athorn, Clark & Partners, which also designed the new site.
Having a sole breadwinner is a quaint, if outdated, idea.
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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