| hush-hush(adjective, quiet, show, separate, informal) |
| mysterious(adjective, quiet, evil, obscure, dark) |
| surreptitious(adjective, dishonest, deceitful, hidden, sly) |
| closed book(noun, expression, idiom, trouble, challenge) |
| stealthy(adjective, close, quiet, clandestine, concealed) |
| arcane(adjective, evil, obscure, strange, odd) |
| gut(adjective, intimate, private, mental, inside) |
| recondite(adjective, evil, obscure, dark, strange) |
| viscerous(adjective, intimate, private, mental, inside) |
| mystic(adjective, hard, evil, obscure, dark) |
| puzzle(noun, trouble, challenge, question, mystery) |
| inner(adjective, intimate, private, mental, inside) |
| inside(adjective, show, private, mental, clandestine) |
| mystical(adjective, evil, obscure, dark, property) |
| undercover(adjective, quiet, show, obscure, dishonest) |
| unknown(noun, adjective, obscure, dark, superior) |
| deep(adjective, evil, obscure, humble, thoughtful) |
| remote(adjective, close, quiet, obscure, mild) |
| secluded(adjective, close, quiet, show, obscure) |
| unrevealed(noun, adjective, obscure, dark, mysterious) |