closed book meaning in Hindi

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This'closed book'was sold to Chesnara for ?7.5 million on 5 May 2005.
I d prefer to think of it as a closed book ."
A central reading room offers access to open and closed book stacks.
"As far as we're concerned, it's a closed book, " he said.
Slocum considers the Aggies'internal strife a private matter and a closed book.
As he saw it, " They were thought of as a closed book.
Others clap, or open and close books in which the pictures are moving.
The IFPA requires individuals to take a closed book, proctored exam.
The thing Valentine likes about Hough is that he isn't a closed book.
Interesting even for those of us to whom numismatics is a closed book.

noun.

something that baffles understanding and cannot be explained; "how it got out is a mystery"; "it remains one of nature''s secrets"
synonyms：, ,