a closed book

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a closed book

Someone or something that is difficult to know or understand. She's such a private person that I don't actually know very much about her. I guess I married a closed book. I'm a scientist through and through, so art has always been a closed book to me.
See also: book, closed
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

closed book, a

A secret, mystery, or puzzle, as in I can't figure her out; she's a closed book to me. This term alludes to information one can't obtain or comprehend (because the book is closed). [Early 1900s]
See also: closed
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

a closed book

BRITISH
If something or someone is a closed book to you, you know or understand very little about them. Economics were a closed book to him. He is such a closed book, that guy. Compare with an open book.
See also: book, closed
Collins COBUILD Idioms Dictionary, 3rd ed. © HarperCollins Publishers 2012

a closed book

a thing of which you have no knowledge or understanding.
1944 Frank Clune The Red Heart The desert is an open book to the man of the Vast Open Spaces, but to the schoolmaster it was a closed book.
See also: book, closed
Farlex Partner Idioms Dictionary © Farlex 2017

a closed ˈbook (to somebody)

a person or a subject that you know nothing about: I’m afraid geophysics is rather a closed book to me.Please let’s not talk about her former life, that’s all a closed book now.
See also: book, closed
Farlex Partner Idioms Dictionary © Farlex 2017
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References in periodicals archive ?
Sapiens International Corporation (NASDAQ: SPNS) (TASE: SPNS) said it has begun the migration of Wesleyan Assurance Society's legacy portfolios to Sapiens' Closed Book solution platform.
The outsourcing decision has other long-range implications, as well, since future acquisitions may result in similar closed books. "We're constantly comparing and contrasting the UISL's ability to run that sort of book outside our operation with our ability to do it inhouse," says Thompson, noting that the administration of the Lloyd's TSB brand has been insourced.
22 March 2013 - Belgium's KBC Group NV (EBR:KBC) and Spain's Banco Santander SA (MCE:SAN) have closed books on their placement of a minority interest in Polish lender Bank Zachodni WBK (BZ WBK) to institutional investors at PLN245.00 (USD75.42/EUR58.46) a share, Reuters reported, quoting three unidentified market sources.
A ministry official said overall tax revenue collection is proceeding at the projected pace, but a final assessment must wait until companies that closed books in March pay their corporate taxes in May.
The demerged company, called Chesnara, would continue to sell guaranteed income bonds and provide services to existing policyholders and would probably seek to acquire or manage other closed books of insurance business.
Haseko agreed with Daiwa Bank and other financial institutions to waive 354.6 billion yen in debts in May 1999, which enabled the contractor to liquidate capital deficit on a consolidated basis when it closed books last March.
"With this you'll be able read closed books without touching them, scan documents without leaving fingerprints, and check enemy agents for hidden weapons under their clothing."
Meanwhile, Japan's tax revenue in April fell 2.2% from a year earlier to 4,651.10 billion yen, partly because department stores that closed books Feb.
M2 EQUITYBITES-March 11, 2015-Wesleyan implements Sapiens' Closed Book platform