| hidden(obscure, new, remote, mysterious, secret) |
| little known(expression, strange, new, remote, mysterious) |
| mysterious(strange, new, remote, indefinite, unidentified) |
| nameless(strange, new, remote, mysterious, indefinite) |
| new(strange, remote, mysterious, indefinite, unidentified) |
| obscure(strange, secret, unknown, hidden, indefinite) |
| obscured(secret, hidden, clandestine, underground, underhanded) |
| perdu(adjective, secret, hidden, covered, obscured) |
| privy(secret, hidden, clandestine, underground, underhanded) |
| put in the hole(adjective, secret, hidden, covered, obscured) |
| remote(strange, new, mysterious, indefinite, unidentified) |
| secret(strange, new, remote, mysterious, hidden) |
| shrouded(adjective, secret, hidden, underhanded, covered) |
| so-and-so(strange, new, remote, mysterious, indefinite) |
| strange(new, remote, mysterious, indefinite, unidentified) |
| sub rosa(expression, secret, clandestine, underground, underhanded) |
| such-and-such(strange, new, remote, mysterious, indefinite) |
| tucked away(adjective, secret, hidden, covered, obscured) |
| ulterior(secret, hidden, underground, underhanded, covered) |
| unapprehended(strange, new, remote, mysterious, indefinite) |