a closed book
noun
: a person or thing that is difficult to understand
Even to his closest friends, he was always something of a closed book.
Dictionary Entries Near a closed book
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“A closed book.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/a%20closed%20book. Accessed 19 Apr. 2024.
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