closed book, a

A secret, mystery, or puzzle, as in I can't figure her out; she's a closed book to me. This term alludes to information one can't obtain or comprehend (because the book is closed). [Early 1900s]

Common Names:

Name	Pronounced	Usage
Tamika	tə-MEE-kə	English
Seona	-	Scottish
Mica	-	English
Aatu	AH:-too	Finnish
Vishnu	VISH-noo (Hinduism)	Hinduism, Indian, Malayalam, Kannada, Telugu, Tamil, Hindi, Marathi
AmÉRico	ah-ME-ree-ko (Spanish)	Spanish, Portuguese