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
Relevance
Example Sentences
Recent Examples of Synonyms for closed books
Noun
-
But she's also got her own mysteries to solve.—
Randall Colburn,
Entertainment Weekly,
16 Sep. 2025 -
The planet’s extreme inhospitality is at the heart of one of the most beguiling mysteries in planetary science.—
Quanta Magazine,
Quanta Magazine,
15 Sep. 2025
Noun
-
Like its predecessors, Yoshi and the Mysterious Book will likely be one of Nintendo’s more accessible games, filled with simple puzzles and exploration that don’t require much precision.—
Christopher Cruz,
Rolling Stone,
12 Sep. 2025
-
The precise physics behind ULXs remains one of astronomy's enduring puzzles, and each galaxy that hosts them, including NGC 7456, can provide key clues.—
Kenna Hughes-Castleberry,
Space.com,
11 Sep. 2025
Noun
-
Pasteur himself didn’t opine on whether this might threaten existing life, but others were soon expressing unease following his breakthroughs in unlocking life’s chemical secrets.—
Thomas Moynihan,
Big Think,
15 Sep. 2025
-
As always, secrets emerge, fights ensue, and Madea makes a speech to bring everyone back together.—
Declan Gallagher,
Entertainment Weekly,
14 Sep. 2025
Examples are automatically compiled from online sources to
show current usage.
Read More
Opinions expressed in the examples do not represent those of Merriam-Webster or its editors.
Send us feedback.
Cite this Entry
“Closed books.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/closed%20books. Accessed 20 Sep. 2025.
Copy CitationLove words? Need even more definitions?
Merriam-Webster unabridged
Share