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Closed book
noun
Definitions
Noun
- 1 A person or thing that cannot be easily understood; someone or something incomprehensible or puzzling. idiomatic
"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!"
- 2 something that baffles understanding and cannot be explained wordnet
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