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A person or thing that cannot be easily understood; someone or something incomprehensible or puzzling.

"Her courteous, sedate, inexorable husband, whose will she could not bend, whom she could not cajole, whose mind was a closed book to her — a book which had lain by her hand for three years, which she had never had the curiosity to open!" — Prisoners by Mary Cholmondeley.


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"closed book." STANDS4 LLC, 2018. Web. 15 Oct. 2018. <>.

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