| QT(adjective, secret, unknown, isolated, hidden) |
| abstruse(adjective, obscure, dark, unknown, hidden) |
| close(adjective, obscure, dark, unknown, hidden) |
| clouded(adjective, obscure, dark, unknown, hidden) |
| concealed(adjective, obscure, dark, mysterious, secret) |
| cryptic(adjective, obscure, dark, unknown, hidden) |
| eclipsed(adjective, obscure, dark, unknown, hidden) |
| esoteric(adjective, obscure, dark, unknown, hidden) |
| hermetic(adjective, obscure, dark, unknown, hidden) |
| hermetical(adjective, obscure, dark, unknown, hidden) |
| hidden(adjective, mysterious, secret, private, unknown) |
| imperceivable(adjective, obscure, dark, unknown, hidden) |
| in the dark(expression, adjective, idiom, obscure, dark) |
| indiscernible(adjective, obscure, dark, unknown, hidden) |
| invisible(adjective, obscure, dark, unknown, hidden) |
| latent(adjective, obscure, dark, unknown, hidden) |
| mysterious(adjective, obscure, dark, unknown, hidden) |
| mystic(adjective, obscure, dark, unknown, hidden) |
| mystical(adjective, obscure, dark, unknown, hidden) |
| obscure(adjective, dark, secret, unknown, hidden) |