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View synonyms for closed book
closed book
noun
- 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
- something deemed unknown or incapable of being understood
- a matter that has been finally concluded and admits of no further consideration
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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.
From Washington Post
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.
From Literature
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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