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A person who through naivete responds candidly to questions or openly displays their emotions or intentions.

Additional definitions for 'open book':

open bookSomething of which salient aspects are obvious or easily interpreted.
open bookAn open book decomposition.
open bookAn inside angle in the rock.
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"open book." Phrases.net. STANDS4 LLC, 2017. Web. 20 Nov. 2017. <http://www.phrases.net/phrase/open-book_14030>.

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