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View synonyms for closed book

closed book

noun

  1. something that is not known or cannot be understood; a mystery or puzzle:

    Abstract art is a closed book as far as I'm concerned.



closed book

noun

  1. something deemed unknown or incapable of being understood
  2. a matter that has been finally concluded and admits of no further consideration
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word History and Origins

Origin of closed book1

First recorded in 1910–15
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Example Sentences

Mr Ba may have been on the political scene for the last decade, but he is a bit of a closed book for most.

From BBC

“As you know, I’m not normally a closed book on this stuff,” Sean told me.

When the bank collapsed, her loan was one of thousands sold by the government to so-called "closed book" lenders.

From BBC

The answer was always there, tucked away within the brittle pages of that closed book—Papá.

A "free hit" is how Mott described the je ne sais quoi that Stokes brings to the team, with his inclusion in England's XI a closed book as far as Foster is concerned.

From BBC

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