a closed book

Someone or something that is difficult to know or understand. She's such a private person that I don't actually know very much about her. I guess I married a closed book. I'm a scientist through and through, so art has always been a closed book to me.

See also: book, closed

Farlex Dictionary of Idioms.

closed book, a

A secret, mystery, or puzzle, as in I can't figure her out; she's a closed book to me. This term alludes to information one can't obtain or comprehend (because the book is closed). [Early 1900s]

a closed book

BRITISH

If something or someone is a closed book to you, you know or understand very little about them. Economics were a closed book to him. He is such a closed book, that guy. Compare with an open book.

See also: book, closed

Collins COBUILD Idioms Dictionary, 3rd ed.

a closed book

a thing of which you have no knowledge or understanding.

1944 Frank Clune The Red Heart The desert is an open book to the man of the Vast Open Spaces, but to the schoolmaster it was a closed book.

See also: book, closed

Farlex Partner Idioms Dictionary

a closed ˈbook (to somebody)

a person or a subject that you know nothing about: I’m afraid geophysics is rather a closed book to me. Please let’s not talk about her former life, that’s all a closed book now.

See also: book, closed

Farlex Partner Idioms Dictionary

See also:

closed book, a
be a closed book
I know
Don’t I know it!
don't I know it
know (someone or something) inside out
know inside out
know somebody/something inside out
know someone or something inside out
know something/someone inside out

词组	a closed book
释义	a closed book a closed book Someone or something that is difficult to know or understand. She's such a private person that I don't actually know very much about her. I guess I married a closed book. I'm a scientist through and through, so art has always been a closed book to me. See also: book, closed Farlex Dictionary of Idioms. closed book, a A secret, mystery, or puzzle, as in I can't figure her out; she's a closed book to me. This term alludes to information one can't obtain or comprehend (because the book is closed). [Early 1900s] See also: closed The American Heritage® Dictionary of Idioms by Christine Ammer. a closed book BRITISH If something or someone is a closed book to you, you know or understand very little about them. Economics were a closed book to him. He is such a closed book, that guy. Compare with an open book. See also: book, closed Collins COBUILD Idioms Dictionary, 3rd ed. a closed book a thing of which you have no knowledge or understanding. 1944 Frank Clune The Red Heart The desert is an open book to the man of the Vast Open Spaces, but to the schoolmaster it was a closed book. See also: book, closed Farlex Partner Idioms Dictionary a closed ˈbook (to somebody) a person or a subject that you know nothing about: I’m afraid geophysics is rather a closed book to me. Please let’s not talk about her former life, that’s all a closed book now. See also: book, closed Farlex Partner Idioms Dictionary See also: closed book, a be a closed book I know Don’t I know it! don't I know it know (someone or something) inside out know inside out know somebody/something inside out know someone or something inside out know something/someone inside out
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