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closed book

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.
Origin of closed book
First recorded in 1910-15 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for closed book
Historical Examples
  • To them all he was a closed book, tight-lipped, a mask of brooding care.

    The Prisoner Alice Brown
  • It seemed to be in the nature of a closed book with the child.

  • He felt that in a case of this sort a girl's mind was a closed book to him.

    Half a Hero Anthony Hope
  • The girl sat with closed book, looking at his face as he slept.

    Wayside Courtships Hamlin Garland
  • With the closed book as a writing-pad, he addressed the envelope.

  • But whatever his story might have been, it must ever be to me a closed book.

  • She had, for instance, a command of blandishments which to her elder were a closed book.

    Too Old for Dolls

    Anthony Mario Ludovici
  • Dante was, of course, a closed book to him as to most of his contemporaries.

  • The life of that man was a closed book she had never wished to open.

    A Modern Chronicle, Complete Winston Churchill
  • I tried to speak to him about the roughness of the investigators, but he is a closed book as to that.

    Crimes of Charity Konrad Bercovici
British Dictionary definitions for closed book

closed book

something deemed unknown or incapable of being understood
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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