Sentence examples for closed book from inspiring English sources
Suggestions(5)
"closed book" is correct and usable in written English.
You can use it to refer to something that is not open to investigation or discussion, or something that is not up for debate or change. For example: "The decision is a closed book - no one is allowed to question it."
Dictionary
closed book
noun
A person or thing that cannot be easily understood; someone or something incomprehensible or puzzling.
- "Her courteous, sedate, inexorable husband, whose will she could not bend, whom she could not cajole, whose mind was a closed book to her a book which had lain by her hand for three years, which she had never had the curiosity to open!" Prisoners by Mary Cholmondeley
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