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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Also, any excuse to watch Bill Nighy, who stars as Doctor Lazarus, whose death plunges his forensic psychologist son (Sam Clafin) into a labyrinth of family mysteries.—
Emily Temple
September 30,
Literary Hub,
30 Sep. 2025 -
Director Jean-François Poisson’s film centers on the lingering questions and mysteries surrounding the demise of the Expos.—
Ryan Gajewski,
HollywoodReporter,
29 Sep. 2025
Noun
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These are not just research puzzles but ethical responsibilities.—
Ekaterina Muravevskaia,
The Conversation,
2 Oct. 2025
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Earlier tests measured relatively abstract capabilities on reasoning puzzles and exam-style questions.—
Nikita Ostrovsky,
Time,
1 Oct. 2025
Noun
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Specifically, their alliance begins after a prominent lawyer is brutally killed, shortly after agreeing to reveal secrets from his criminal past in a tell-all book that Falch was going to write.—
Jesse Whittock,
Deadline,
29 Sep. 2025
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Some of the secrets in Stein’s archive are, like the contents of a laundry hamper, both poignantly human and embarrassing.—
Judith Thurman,
New Yorker,
29 Sep. 2025
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“Closed books.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/closed%20books. Accessed 5 Oct. 2025.
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