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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.
Origin
1910-1915
1910-15
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for closed-book

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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9
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