| mystery | (n) something that baffles understanding and cannot be explained, Syn. secret, enigma, closed book |
| Das ist ein Buch mit sieben Siegeln. | It's a closed book. [Add to Longdo] |
| 一寸先は闇 | [いっすんさきはやみ, issunsakihayami] (exp) No one knows what the future holds; The future is a closed book [Add to Longdo] |