closed book

closed book

noun

Definition of CLOSED BOOK

: something beyond comprehension : enigma

Examples of CLOSED BOOK

1. <the couple's unorthodox marriage is definitely a closed book to those outside of the relationship>

First Known Use of CLOSED BOOK

1913

Related to CLOSED BOOK

Synonyms: mystery, conundrum, enigma, head-scratcher, mystification, puzzle, puzzlement, riddle, secret

Related Words: brainteaser, case, challenge, knot, matter, perplexity, poser, problem, stumper, trouble

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Rhymes with CLOSED BOOK

bankbook, billhook, black book, blue book, boat hook, cant hook, caoutchouc, casebook, chapbook, checkbook, Chinook, codebook, cookbook, daybook, duck hook, e-book, fishhook, gang hook, good book, guidebook, handbook, hornbook, hymnbook, Innsbruck, jump hook, logbook, make book, matchbook, mouth hook, nainsook, nonbook, notebook, outlook, passbook, Pembroke, phrase book, playbook, pothook, prayer book, promptbook, psalmbook, schoolbook, scrapbook, sketchbook, skyhook, songbook, sourcebook, studbook, stylebook, textbook, trade book, unhook, white book, Windhoek, wordbook, workbook, yearbook