Thesaurus

closed book

noun

Synonyms of closed book

something hard to understand or explain
  • the couple's unorthodox marriage is definitely a closed book to those outside of the relationship

Synonyms for closed book

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Time Traveler for closed book

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The first known use of closed book was in 1913

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Cite this Entry

“Closed book.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/closed%20book. Accessed 12 May. 2021.

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