| hidden(adjective, obscure, mysterious, secret) |
| concealed(adjective, obscure, dark, mysterious) |
| mysterious(adjective, obscure, dark, remote) |
| unidentified(adjective, strange, remote, mysterious) |
| untold(adjective, strange, remote, mysterious) |
| undiscovered(adjective, strange, remote, mysterious) |
| strange(adjective, obscure, remote, mysterious) |
| unapprehended(adjective, strange, remote, mysterious) |
| unascertained(adjective, strange, remote, mysterious) |
| uncharted(adjective, strange, remote, mysterious) |
| unexplained(adjective, strange, remote, mysterious) |
| unexplored(adjective, strange, remote, mysterious) |
| unfamiliar(adjective, strange, remote, mysterious) |
| unperceived(adjective, strange, remote, mysterious) |
| alien(adjective, strange, remote, mysterious) |
| desolate(adjective, strange, remote, mysterious) |
| foreign(adjective, strange, remote, mysterious) |
| incognito(adjective, strange, remote, indefinite) |
| nameless(adjective, strange, remote, mysterious) |
| unheard-of(adjective, strange, remote, indefinite) |