sealed /siːld/ adjective

1. shut or protected with something that prevents air, water etc from getting in or out:
a sealed container

2. sealed documents are closed so that they can only be read by a certain person or at a certain time:
Sealed bids (=offers to pay a particular price for something) should be sent to Richard Walker.

[TahlilGaran] Dictionary of Contemporary English ▲

sealed

firmly/tightly sealed
The box was firmly sealed with tape.
completely sealed
The bag is completely sealed and airtight.
hermetically sealed (=very tightly sealed so that nothing can get in or out)
Inside, police found hermetically sealed cabinets full of marijuana.
a sealed envelope
Jenkins handed Talbot a sealed envelope.
a sealed container/box/plastic bag
The specimens he collected were sent back to London in sealed containers.

[TahlilGaran] Collocations Dictionary ▲