| unascertained(strange, new, remote, mysterious, indefinite) |
| uncelebrated(strange, new, remote, mysterious, indefinite) |
| uncharted(strange, new, remote, mysterious, indefinite) |
| under-the-table(secret, hidden, clandestine, underground, underhanded) |
| undiscovered(strange, new, remote, mysterious, indefinite) |
| undistinguished(strange, new, remote, indefinite, unidentified) |
| unexplained(strange, new, remote, mysterious, indefinite) |
| unexplored(strange, new, remote, mysterious, indefinite) |
| unfamiliar(strange, new, remote, mysterious, indefinite) |
| unheard-of(strange, new, remote, indefinite, unidentified) |
| unidentified(strange, new, remote, mysterious, indefinite) |
| unknown(adjective, obscure, strange, mysterious, indefinite) |
| unnamed(strange, indefinite, unidentified) |
| unnoted(strange, new, remote, indefinite, unidentified) |
| unperceived(strange, new, remote, mysterious, indefinite) |
| unrecognised(adjective, new, remote, mysterious) |
| unrecognized(adjective, obscure, new, remote, mysterious) |
| unrenowned(strange, new, remote, mysterious, indefinite) |
| unrevealed(strange, new, remote, mysterious, indefinite) |
| unsung(strange, new, remote, indefinite, unidentified) |