open-book

open book

noun
someone or something easily understood or interpreted; something very clear: The child's face is an open book.

Origin:
1850–55

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
open book
 
n
a person or thing without secrecy or concealment that can be easily known or interpreted

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Dictionary.com's 21st Century Lexicon
Main Entry:  open-book
Part of Speech:  adj
Definition:  pertaining to a test during which a student may refer to a book or books
Example:  He did not prepare very much for the open-book test.
Dictionary.com's 21st Century Lexicon
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