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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In this new show, unlikely friends Marsha and Wendy wrestle with the mysteries of the teenage heart (and dragons), while jumping between alchemy class, dodgeball and theater club in a melodrama about the unusual humans and mutants that attend an ailing public boarding school.—
Kevin Giraud,
Variety,
11 May 2026 -
Directed by Kyle Balda, The Sheep Detectives stars Jackman as George, a shepherd who reads whodunit novels to his sheep at night, not realizing that his woolly companions actually understand the murder mysteries.—
Tim Lammers,
Forbes.com,
9 May 2026
Noun
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Thank you again from all the Daily News readers who do her puzzles.—
Voice of the People,
New York Daily News,
14 May 2026
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Check out the all new PLAY hub with puzzles, games and more!—
Amaris Encinas,
USA Today,
14 May 2026
Noun
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Lebedev also mentioned that the dozens of production secrets and a number of patented solutions were used in the manufacture of reactor units.—
Abhishek Bhardwaj,
Interesting Engineering,
15 May 2026
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Both teenagers are hiding secrets; Johnny, a potentially career-ending injury, and Shannon, a troubled and violent home life.—
Arushi Jacob,
Variety,
15 May 2026
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“Closed books.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/closed%20books. Accessed 18 May. 2026.
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