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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Some caution against directly linking evolving scientific theories to faith, while others argue that contemplating cosmic mysteries deepens both scientific and spiritual understanding.—
Deepa Bharath,
Los Angeles Times,
30 Mar. 2026 -
But to defeat such a powerful villain, Prince Adam will first need to uncover the mysteries of his past and become He-Man, the most powerful man in the Universe.—
Glenn Garner,
Deadline,
28 Mar. 2026
Noun
-
Check out the all new PLAY hub with puzzles, games and more!—
Ralphie Aversa,
USA Today,
2 Apr. 2026
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There are many puzzles that hint at this.—
Big Think,
Big Think,
19 Mar. 2026
Noun
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In 2024, the National Institute of Standards and Technology published new codes that can keep secrets safe from both classical and quantum computers.—
Quanta Magazine,
Quanta Magazine,
3 Apr. 2026
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However, everything changes with the arrival of a new neighbor (James Marsden), who threatens to expose Coop’s secrets.—
Liza Esquibias,
PEOPLE,
3 Apr. 2026
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“Closed books.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/closed%20books. Accessed 6 Apr. 2026.
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