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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The latest entry in the iconic survival horror franchise from developer Capcom brings players back to Racoon City with tense gameplay, immersive mysteries and the return of fan-favorite characters.—
Arushi Jacob,
Variety,
27 Feb. 2026 -
Conductors struggle to get a handle on its mysteries and intricacies.—
Classical Music Critic,
Los Angeles Times,
25 Feb. 2026
Noun
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Check out the all new PLAY hub with puzzles, games and more!—
Anna Kaufman,
USA Today,
4 Mar. 2026
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However, there are several puzzles that arise.—
Big Think,
Big Think,
3 Mar. 2026
Noun
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After nine episodes spent stewing in suspicion, the CBS legal drama has released the tension from one of its biggest secrets and forced Julian into action.—
Alison Foreman,
IndieWire,
27 Feb. 2026
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But the show finds a unique voice fast, revealing a sense of humor that is gentler than that of its influences and unusually nuanced in its take on suburban secrets.—
Judy Berman,
Time,
27 Feb. 2026
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“Closed books.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/closed%20books. Accessed 8 Mar. 2026.
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