closed books

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

Synonyms & Similar Words

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Example Sentences

Recent Examples of Synonyms for closed books
Noun
  • Sign up for Being Human, our newsletter that explores wellness culture, human behavior, mortality and disease, and other mysteries of the body and the mind.
    Helen Ouyang, The Atlantic, 21 Oct. 2025
  • All these small pleasures that most children know are still mysteries to her.
    Literary Hub, Literary Hub, 21 Oct. 2025
Noun
  • Check out the all new PLAY hub with puzzles, games and more!
    Chris McKeown, Cincinnati Enquirer, 25 Oct. 2025
  • Check out the all new PLAY hub with puzzles, games and more!
    Amanda Hancock, Louisville Courier Journal, 24 Oct. 2025
Noun
  • Robert surreptitiously attains Alfred’s workbook/diary, where many secrets may exist.
    Kirk Honeycutt, HollywoodReporter, 20 Oct. 2025
  • Set clear boundaries Talk about what's appropriate to share online, and explain that AI chatbots cannot keep secrets or replace human relationships.
    Kurt Knutsson, FOXNews.com, 19 Oct. 2025
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.

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“Closed books.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/closed%20books. Accessed 26 Oct. 2025.

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