Similar words: closed book, sealed, unsealed, sealed off, handbook, good book, bound book, record book.
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1) It's a sealed book to me.
2) He is a sealed Book to her.
3) Books were beyond her interest - knowledge a sealed book.
4) Fifteenth - century art was a sealed book to him.
5) The origin of the universe is still a sealed book to us.
6) I know a little Russian, but this is a sealed book to me.
7) The young generation was always something of a sealed book to Mr Smith.
More similar words: closed book, sealed, unsealed, sealed off, handbook, good book, bound book, record book, casebook, bookcase, phrasebook, phrase book, sealer, sea legs, healed, sea level, sea lettuce, unhealed, annealed, revealed, concealed, congealed, unrevealed, unconcealed, venereal disease, communicable disease, speedboat, cookery book, red bone marrow, cookbook.