FAQs About the word closed book

closed book

something that baffles understanding and cannot be explained

Mystery,challenge,Conundrum,enigma,Head-scratcher,question,mystification,Puzzle,puzzlement,Riddle

No antonyms found.

closed => Closed, close-bodied => Close-fitting, close-barred => Close-barred, close-banded => Close-banded, close up => close up,