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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For nearly five decades, NASA's twin Voyager probes have plumbed the cosmos in search of answers to some of astronomy's most perplexing mysteries about our solar system and its place in the wider universe.—
Eric Lagatta,
USA Today,
8 Sep. 2025 -
While researchers will continue to study the Galilean moons with Juno, the spacecraft will be joined by others in the coming years, potentially solving even more mysteries in the Jovian system.—
Stefanie Waldek,
Space.com,
8 Sep. 2025
Noun
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Like its predecessors, Yoshi and the Mysterious Book will likely be one of Nintendo’s more accessible games, filled with simple puzzles and exploration that don’t require much precision.—
Christopher Cruz,
Rolling Stone,
12 Sep. 2025
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The precise physics behind ULXs remains one of astronomy's enduring puzzles, and each galaxy that hosts them, including NGC 7456, can provide key clues.—
Kenna Hughes-Castleberry,
Space.com,
11 Sep. 2025
Noun
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In her latest Jo + Tiny Mic series on Instagram, the Texas native shared four of her favorite secrets to instantly elevate a room, and the principles can be perfectly applied to your fall home decor using Gaines’ very own Magnolia collection at Target.—
Stephanie Osmanski,
Better Homes & Gardens,
9 Sep. 2025
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As war rages in Europe, the two children navigate danger and secrets that challenge their understanding of family and friendship, reshaping their childhoods forever.—
Elsa Keslassy,
Variety,
8 Sep. 2025
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“Closed books.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/closed%20books. Accessed 15 Sep. 2025.
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