something beyond understanding and therefore unknown.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use sealed book in a sentence
Old and new measurements, tonnage, time allowances and movable ballast, are all a sealed book to me.The Pit Town Coronet, Volume II (of 3) | Charles James Wills
But, if you come to look at the matter closely, you will see that the time present is also in some sense a sealed book to us.Friends in Council | Arthur Helps
And yet, in spite of it all, Judeo-German has remained practically a sealed book to the world.
Monsieur Calonne had read my inmost heart, whilst I foolishly imagined it was a sealed book!Bentley's Miscellany, Volume II | Various
From this cause the characters of those nearest and dearest to him remained to his life's end a sealed book.The Book-Hunter | John Hill Burton
British Dictionary definitions for sealed book
another term for closed book
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012