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
-
In truth, the mysteries and compromises of mapping New York are evident every day.—
Adam Gopnik,
New Yorker,
4 Jan. 2026 -
The gang was younger, the mysteries were smaller, and everything felt lighter.—
Alex Shoemaker,
Parents,
4 Jan. 2026
Noun
-
Check out the all new PLAY hub with puzzles, games and more!—
Eve Chen,
USA Today,
15 Jan. 2026
-
Nevertheless, this research represents an intriguing attempt to solve three cosmological puzzles with one mechanism.—
Robert Lea,
Space.com,
15 Jan. 2026
Noun
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Imperfect Women Apple TV, March 18 Elisabeth Moss and Kerry Washington star in Annie Weisman’s adaptation of Hall’s psychological thriller about three friends who find their secrets exposed after one of them is murdered.—
Emily Temple,
Literary Hub,
12 Jan. 2026
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Any secrets to longevity to share?—
Alice Newbold,
Vogue,
12 Jan. 2026
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“Closed books.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/closed%20books. Accessed 16 Jan. 2026.
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