| mysterious(strange, remote, unknown, indefinite) |
| nameless(strange, remote, mysterious, indefinite) |
| secret(obscure, strange, remote, mysterious) |
| so-and-so(strange, remote, mysterious, indefinite) |
| such-and-such(strange, remote, mysterious, indefinite) |
| unapprehended(strange, remote, mysterious, indefinite) |
| unascertained(strange, remote, mysterious, indefinite) |
| uncelebrated(strange, remote, mysterious, indefinite) |
| uncharted(adjective, strange, remote, mysterious) |
| undiscovered(strange, remote, mysterious, indefinite) |
| undistinguished(strange, remote, indefinite, unidentified) |
| unexplained(strange, remote, mysterious, indefinite) |
| unheard-of(strange, remote, indefinite, unidentified) |
| unidentified(strange, remote, mysterious, indefinite) |
| unknown(adjective, obscure, experience, distant) |
| unnoted(strange, remote, indefinite, unidentified) |
| unperceived(strange, remote, mysterious, indefinite) |
| unrecognized(strange, remote, mysterious, indefinite) |
| unrenowned(strange, remote, mysterious, indefinite) |
| unrevealed(strange, remote, mysterious, indefinite) |