| unexplained(strange, new, remote, indefinite, unidentified) |
| unexplored(strange, new, remote, indefinite, unidentified) |
| unfamiliar(adjective, strange, indefinite, unidentified) |
| unheard-of(adjective, strange, new, remote, unknown) |
| unnoted(strange, new, remote, unknown, indefinite) |
| unperceived(strange, new, remote, indefinite, unidentified) |
| unrenowned(strange, new, remote, indefinite, unidentified) |
| unrevealed(strange, new, remote, indefinite, clandestine) |
| unseen(secret, hidden, clandestine, underground, undisclosed) |
| unsung(adjective, strange, new, remote, unknown) |
| untold(strange, new, remote, indefinite, unidentified) |
| veiled(secret, hidden, clandestine, underground, underhanded) |
| visor |
| vizard |
| vizard mask |
| withdrawn |
| without a name(expression, idiom) |
| alien(strange, new, remote, indefinite, unidentified) |
| anonymousness |
| backdoor(close, clandestine, underground, undisclosed, furtive) |