Thesaurus results for CLOSED BOOKS

closed books

noun

plural of closed book

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

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Recent Examples of Synonyms for closed books

Noun

With the capability of observing the cosmos with a wide field of view, Roman will generate first-of-their-kind images to help astronomers explore some of the greatest mysteries, including the unexplained expansion of the universe, according to NASA.

— Eric Lagatta, USA Today, 25 Aug. 2026
And yes, thankfully, that does include taking a visit to a more rural part of the country, where — as any fan of British cozy mysteries will tell you — some of the most interesting murders take place.

— Josef Adalian, Vulture, 25 Aug. 2026

Definition of mysteries

Noun

Most people have read studies about crosswords, puzzles, sudoku, and any other games that test people’s ability to solve problems and prevent neurological problems.

— Connie Etermadi, USA Today, 26 Aug. 2026
Over the years, The Book Rack has offered thousands of books across a wide range of fiction and nonfiction genres, along with candles, notebooks, bookish gifts and more than 100 puzzles.

— Jessica Alvarado Gamez, Denver Post, 20 Aug. 2026

Definition of puzzles

Noun

In kitchens, courtyards, bedrooms and on the streets, women shared jokes, secrets, gestures of care and moments of freedom.

— PhotoVogue, Vogue, 29 Aug. 2026
The smell of freshly ground espresso and incense fills the air, and staff speak to patients in hushed, discreet tones, almost as if discussing state secrets.

— Christopher Elliott, Forbes.com, 29 Aug. 2026

Definition of secrets

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“Closed books.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/closed%20books. Accessed 30 Aug. 2026.

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Synonyms of closed books

noun

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