| desolate(adjective, strange, new, remote, mysterious) |
| dormant |
| foreign(adjective, strange, new, remote, mysterious) |
| hermetic(adjective, obscure, dark, deep, mysterious) |
| in the dark(expression, adjective, idiom, obscure, dark) |
| incognito(adjective, strange, new, remote, indefinite) |
| indiscernible(adjective, obscure, dark, unknown, hidden) |
| masked |
| nameless(adjective, strange, new, remote, mysterious) |
| passive |
| screened(adjective, obscure, dark, unknown, hidden) |
| secluded(adjective, obscure, dark, unknown, hidden) |
| sequestered(adjective, obscure, dark, unknown, hidden) |
| shadowy(adjective, obscure, dark, unknown, hidden) |
| shrouded(adjective, obscure, secret, unknown, hidden) |
| stifled |
| top-secret(clandestine, underground, undisclosed) |
| top secret(expression, clandestine, underground, undisclosed) |
| unbeknown |
| uncanny(adjective, obscure, dark, superior, mysterious) |