Thesaurus

closed books

noun
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

Synonyms for closed books

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“Closed books.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/closed%20books. Accessed 4 Aug. 2020.

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