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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But this one also taps into themes of identity and ownership that touch on the mysteries of pop.—
Owen Gleiberman,
Variety,
15 Mar. 2026 -
Ever since that fateful 1950s day in New Jersey when Steve Spielberg's father roused him from slumber to take a late-night rural drive out to watch a spectacular shooting star show, the legendary filmmaker has been fascinated with outer space and the mysteries of the cosmos.—
Jeff Spry,
Space.com,
13 Mar. 2026
Noun
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There are many puzzles that hint at this.—
Big Think,
Big Think,
19 Mar. 2026
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Check out the all new PLAY hub with puzzles, games and more!—
Anthony Robledo,
USA Today,
19 Mar. 2026
Noun
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Arizona's Meteor Crater and other scars leftover from collisions with space rocks continue to serve up their secrets.—
Leonard David,
Space.com,
14 Mar. 2026
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Scientists have harnessed the power of artificial intelligence to unlock secrets hidden within the densest objects in the universe.—
Mrigakshi Dixit,
Interesting Engineering,
13 Mar. 2026
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“Closed books.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/closed%20books. Accessed 20 Mar. 2026.
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