What are some alternative words for closed book?

Synonyms for closed book

This thesaurus page is about all possible synonyms, equivalent, same meaning and similar words for the term closed book.

Princeton's WordNet

  1. mystery, enigma, secret, closed book(noun)

    something that baffles understanding and cannot be explained

    "how it got out is a mystery"; "it remains one of nature's secrets"

    Synonyms:
    arcanum, brain-teaser, whodunit, conundrum, riddle, secret, closed book, enigma, mystery, mystery story

Wiktionary

  1. closed book(noun)

    Antonyms:
    open book

  2. closed book(noun)

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

    Antonyms:
    open book

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"closed book." Synonyms.net. STANDS4 LLC, 2017. Web. 11 Dec. 2017. <http://www.synonyms.net/synonym/closed book>.

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