open book

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open book

noun open books

  1. idiomatic Something whose salient aspects are obvious or easily interpreted. There is one, with a dark and thoughtful eye, Who is to all others a mystery; But his soul is to me an open book, And I read his mood in his slightest look; ...
  2. idiomatic A person who responds candidly to questions or openly displays their emotions or intentions. He is an open book. Everyone can see that he removes nothing, conceals nothing, reserves nothing for himself.

    Similar: one who wears one's heart on one's sleeve

  3. An open book decomposition.
  4. An inside angle in the rock.

Opposite: closed book

Thesaurus

noun

Opposite: closed book

Translations

Every language

noun thing easily interpreted

Españollibro abierto
中文一目瞭然的事物 /一目了然的事物 yīmùliǎorán de shìwù
Portuguêslivro aberto
Françaislivre ouvert
Deutschoffenes Buch
Italianolibro aperto
Русскийоткры́тая кни́га otkrýtaja kníga

noun person who is honest or open

Españollibro abierto
中文易於了解的人 /易于了解的人 yìyú liǎojiě de rén, 胸無城府的人 /胸无城府的人 xiōngwúchéngfǔ de rén
Portuguêslivro aberto
Françaisravi de la crèche
Deutschoffenes Buch
Italianolibro aperto
Русскийоткры́тая кни́га otkrýtaja kníga, на лбу́ напи́сано na lbú napísano

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MLA

"open book." Wiktionary, via Micwyn, micwyn.com/word/open%20book. Accessed 6 Nov. 2026.

APA

open book. (n.d.). In Wiktionary, via Micwyn. Retrieved November 6, 2026, from https://micwyn.com/word/open%20book

Chicago

"open book." Wiktionary, via Micwyn. Accessed November 6, 2026. https://micwyn.com/word/open%20book.

BibTeX
@misc{open_book_2026,
  title = {open book},
  howpublished = {Wiktionary, via Micwyn},
  year = {2026},
  url = {https://micwyn.com/word/open%20book},
  urldate = {2026-11-06}
}