closed book

SEE SYNONYMS FOR closed book ON THESAURUS.COM

noun

something that is not known or cannot be understood; a mystery or puzzle: Abstract art is a closed book as far as I'm concerned.

Origin of closed book

First recorded in 1910–15

Words nearby closed book

close-reefed, close-stool, close-up, closed, closed anesthesia, closed book, closed book, a, closed chain, closed chain compound, closed chest massage, closed circuit

Words related to closed book

riddle, conundrum, subtlety, question, enigma, secrecy, problem, thriller, mystery, dilemma, puzzle, quandary, complexity, teaser, puzzlement, mystification, perplexity, stickler, cliffhanger, twister

British Dictionary definitions for closed book

closed book

noun

something deemed unknown or incapable of being understood
a matter that has been finally concluded and admits of no further consideration