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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." STANDS4 LLC, 2018. Web. 16 Jan. 2018. <>.

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