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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Nonetheless, Simón stirs up the ineffable sadness that comes with wanting answers to the mysteries of your family — and then, like it or not, receiving them.
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Many aspects of the physics underlying GRBs remain enigmatic—but Rubin’s potential for discovering entirely new types of transients could soon offer astronomers a wealth of additional cosmic mysteries to solve.
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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Residents are strictly governed by regulations and believe the outside world is toxic, but the protagonist, an engineer named Juliette Nichols, begins to uncover secrets about the Silo’s history and the truth behind their world.
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Seeking a fresh start, Ellie moves into a house on Delaney Row hoping to leave her troubled past behind, only to discover that her new home is steeped in dark secrets and unsettling mysteries.
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“Closed books.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/closed%20books. Accessed 5 Jul. 2026.
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