Synonyms of 'closed'
Her bedroom door was closed.
No-one was admitted to this closed circle of elite students.
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At last our search is ended.
If you describe something as exclusive, you mean that it is limited to people who have a lot of money or who belong to a high social class, and is therefore not available to everyone.
He is a member of Britain's most exclusive club.
Thesaurus for closed from the Collins English Thesaurus
A closed group of people does not welcome new people or ideas from outside.