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
-
How much hope is left in the search for answers to the many remaining mysteries of the universe?—
Quanta Magazine,
Quanta Magazine,
26 Jan. 2026 -
As researchers continue to unravel the mysteries of why and how these gentle giants make such challenging journeys, their migrations remind us of how interconnected the ecosystems that surround us are.—
Scott Travers,
Forbes.com,
26 Jan. 2026
Noun
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Check out the all new PLAY hub with puzzles, games and more!—
Edward Segarra,
USA Today,
5 Feb. 2026
-
When shown how to open the puzzles, children copied all the steps, even unnecessary ones.—
Literary Hub,
Literary Hub,
29 Jan. 2026
Noun
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Before long, bodies of residents begin turning up, and diary entries from Linda's mother expose dark secrets from the past.—
Kevin Jacobsen,
Entertainment Weekly,
31 Jan. 2026
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As buried family secrets and small-town lies emerge, Courtney must decide who to trust before a shocking revelation changes everything.—
Kait Hanson,
Southern Living,
31 Jan. 2026
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“Closed books.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/closed%20books. Accessed 6 Feb. 2026.
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