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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Albert’s prose sometimes strains for lyricism, but the mysteries embedded in the novel—creative, familial, and supernatural—exert a powerful draw.
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Its goal is to unlock the mysteries of dark energy while planet hunting outside our solar system.
Noun
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Check out the all new PLAY hub with puzzles, games and more!
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To test that, the final group completed cognitively demanding games such as mazes and shape puzzles called tangrams that contained no academic content.
Noun
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Dark visions and secrets quickly come to light, as Mārama grapples with her heritage in the shadow of colonizers.
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The play, which was a finalist for the 1998 Pulitzer Prize for Drama, follows three adult children who meet to settle their fathers’ estate, and, in the process, discover secrets about their parents’ lives.
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“Closed books.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/closed%20books. Accessed 1 Jul. 2026.
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