What is the meaning of closed book?

noun

  • Something that baffles understanding and cannot be explained.
    • usage: "how it got out is a mystery"; "it remains one of nature's secrets"
WordNet 3.0 © 2006 by Princeton University
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APAWordNet. (2010). closed book. Retrieved September 21, 2026, from http://smartdefine.org/closed_book/definitions/1326993
ChicagoWordNet. 2010. "closed book" http://smartdefine.org/closed_book/definitions/1326993 (accessed September 21, 2026).
HarvardWordNet 2010, closed book, Smart Define, viewed 21 September, 2026, <http://smartdefine.org/closed_book/definitions/1326993>.
MLAWordNet. "closed book" 23 October 2010. Web. 21 September 2026. <http://smartdefine.org/closed_book/definitions/1326993>