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Discover LudwigThe phrase "a sealed envelope" is correct and usable in written English.
You can use it when referring to an envelope that has been closed and secured, typically to ensure privacy or confidentiality.
Example: "Please place the important documents in a sealed envelope before sending them out."
Alternatives: "an unopened envelope" or "a closed envelope".
Exact(59)
There is a sealed envelope with my name on it.
Tamara kept her 53 cents in a sealed envelope.
They should arrive in a sealed envelope directly from the institution of study.
By our criterion, transcripts do not need to be in a sealed envelope to be official.
Sater said he gave the plan to Cohen in a sealed envelope.
He called three aides to his side and handed each a sealed envelope.
Participants completed a confidential questionnaire, which was then placed in a sealed envelope.
This had supposedly been delivered to the P.G.R. in a sealed envelope on March 31st.
Someone had left her a sealed envelope with "Congratulations" written on the front.
The authors had left the solution to the anagram in a sealed envelope with the P.Q.
Similar(1)
All study centers receive the randomization documents in a sealed envelope.
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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