Thesaurus
plural of closed book
Synonyms of closed books
something hard to understand or explain
- the couple's unorthodox marriage is definitely a closed book to those outside of the relationship
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“Closed books.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/closed%20books. Accessed 23 Jun. 2021.
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