Definitions from Wiktionary (closed book)
▸ noun: (idiomatic) A person or thing that cannot be easily understood; someone or something incomprehensible or puzzling.
▸ Words similar to closed book
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▸ noun: (idiomatic) A person or thing that cannot be easily understood; someone or something incomprehensible or puzzling.
Similar:
mystery,
enigma,
secret,
unknown quantity,
incomprehension,
darkness,
blindfold,
open book,
opaque,
nonunderstanding,
more...
Opposite:
Phrases:
▸ Words similar to closed book
▸ Usage examples for closed book
▸ Idioms related to closed book
▸ Wikipedia articles (New!)
▸ Words that often appear near closed book
▸ Rhymes of closed book
▸ Invented words related to closed book