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Noun: closed book
  1. Something that baffles understanding and cannot be explained
    "how it got out is a closed book";
    - mystery, enigma, secret

Derived forms: closed books

Type of: perplexity

Nearest

close shave
close support
close supporting fire
close to
close to the wind
close together
close up
close vowel
close-cropped
closed
closed book
closed caption
closed chain
closed circuit
closed corporation
closed couplet
closed curve
closed fracture
closed gentian
closed in
closed interval