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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September 23 – October 22 The horizon holds even more enticing mysteries than usual.—
Tarot.com,
Hartford Courant,
23 Feb. 2026 -
His father shone a spotlight on lunar exploration for Petro, igniting his desire to help solve the moon’s biggest mysteries.—
Ashley Strickland,
CNN Money,
21 Feb. 2026
Noun
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Guests can discover hidden details, solve creative puzzles and unlock tactile surprises hidden throughout the exhibits.—
Alyson Rodriguez,
Dallas Morning News,
25 Feb. 2026
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There are serving pieces from eras when salads were made from gelatin, boxes of puzzles and games, and a rainbow of beautiful glassware fit for dinner.—
Heather Bien,
Martha Stewart,
25 Feb. 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 1 Mar. 2026.
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