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
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If none of those speaks to you, the Victorian era has some fantastic mysteries and ghost stories to get lost in.—
Big Think,
Big Think,
28 Oct. 2025 -
An odd shape in the South Pacific that has sparked the latest push to solve one of the greatest mysteries of all time came to light in a backyard in California.—
Katie Hunt,
CNN Money,
28 Oct. 2025
Noun
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The store sells classroom items, toys, games, puzzles and other specialized educational items.—
Sydney Sasser,
Arkansas Online,
31 Oct. 2025
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Check out the all new PLAY hub with puzzles, games and more!—
Cheryl V. Jackson,
IndyStar,
31 Oct. 2025
Noun
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The series focuses on the Kishan family, a powerhouse British South Asian law firm whose success, secrets and loyalties are about to be tested.—
Lily Ford,
HollywoodReporter,
3 Nov. 2025
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Perhaps the secrets of thinking are simpler than anyone expected—the kind of thing that a high schooler, or even a machine, could understand.—
James Somers,
New Yorker,
3 Nov. 2025
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“Closed books.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/closed%20books. Accessed 5 Nov. 2025.
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