closed book
Americannoun
noun
-
something deemed unknown or incapable of being understood
-
a matter that has been finally concluded and admits of no further consideration
Etymology
Origin of closed book
First recorded in 1910–15
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
That is certainly the case in France, where the foreign intentions of Britain's likely next PM seem like a closed book.
From BBC ● Jul. 12, 2026
“As you know, I’m not normally a closed book on this stuff,” Sean told me.
From Washington Post ● Apr. 26, 2023
And also Keeley didn’t think about that she had hurt Roy, because Roy’s a closed book.
From Los Angeles Times ● Aug. 24, 2021
A lot of the stuff we know as fact turns out to be closed book fiction, a version of the truth steeped in the memory and settled now as a matter of certainty.
From The Guardian ● Apr. 26, 2020
But at the same time he was a closed book.
From "Born a Crime: Stories from a South African Childhood" by Trevor Noah
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
