| faceless |
| fairy(adjective, obscure, dark, superior, mysterious) |
| far(adjective, strange, new, remote, mysterious) |
| far-off(adjective, strange, new, remote, mysterious) |
| faraway(adjective, strange, new, remote, mysterious) |
| furtive(obscure, unknown, clandestine, underground, undisclosed) |
| ghostly(adjective, obscure, dark, superior, mysterious) |
| heavenly(adjective, obscure, dark, superior, mysterious) |
| hermetical(adjective, obscure, dark, unknown, hidden) |
| impenetrable(adjective, obscure, dark, superior, mysterious) |
| imperceivable(adjective, obscure, dark, unknown, hidden) |
| impersonal |
| in private(expression, unknowing, hermetical, unbriefed) |
| in secret(expression, unknowing, hermetical, unbriefed) |
| incalculable |
| incog(adjective, strange, new, remote, mysterious) |
| incognizable |
| inner(adjective, private, mental) |
| legendary(adjective, obscure, dark, superior, mysterious) |
| little known(expression, adjective, strange, new, remote) |