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The phrase "are frowned upon" is correct and usable in written English.
It is typically used to indicate that something is disapproved of or considered socially unacceptable.
Example: "In many cultures, public displays of affection are frowned upon, especially in formal settings."
Alternatives: "are considered inappropriate" or "are looked down upon."
Dictionary
Exact(58)
Excuses are frowned upon.
Profanity and racial slurs are frowned upon.
Ostentatious displays of wealth are frowned upon.
Sunglasses are frowned upon; smiles are encouraged.
(Light yellows are frowned upon, too).
Titles and honorifics are frowned upon.
The atmosphere is casual, but sneakers are frowned upon.
'Hallmark holidays' are frowned upon in my house.
Such excesses, however, are frowned upon by most Sufis.
Small penises are frowned upon, if not deal-breakers.
Similar(1)
Some of them--especially sales--are frowned upon in academia!
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com