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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Noun

There’s much still to learn about this meteorite’s mysteries, says Anya Udry, a planetary scientist at the University of Nevada, Las Vegas, who was not involved with the Science study.

— Mary Randolph, Scientific American, 29 Oct. 2026
An unassuming spinster settled in the English countryside, the majority of Miss Marple's mysteries have taken place right in her own backyard.

— Kat Chen, Condé Nast Traveler, 27 Oct. 2026

Definition of mysteries

Noun

Now, Microsoft says its new artificial intelligence system could help doctors solve some of medicine's toughest diagnostic puzzles.

— Kurt Knutsson, FOXNews.com, 1 Nov. 2026
As he was being treated, his team proceeded without him, running back to the base area to complete the next set of puzzles.

— Breanne L. Heldman, PEOPLE, 1 Nov. 2026

Definition of puzzles

Noun

Too challenging to qualify as radio rock, the Los Angeles songwriter’s cloudy, lo-fi grunge is stuffed with ’90s references and opaque secrets.

— Hannah Jocelyn, Pitchfork, 5 Nov. 2026
Prosecutors say Lemma shared secrets for more than two years and urged Ethiopia to deploy drones against opponents; the disclosures included top-secret satellite imagery and classified reports.

— Amir Aman Kiyaro, Los Angeles Times, 4 Nov. 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 8 Nov. 2026.

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noun

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