| mysterious(clandestine, underground, undisclosed) |
| mystic(clandestine, underground, undisclosed) |
| mystical(clandestine, underground, undisclosed) |
| nescient(unknowing, hermetical, unbriefed) |
| not for publication(expression, idiom, sensitive, sub-rosa) |
| not informed(expression, unknowing, hermetical, unbriefed) |
| not knowing(expression, unknowing, hermetical, unbriefed) |
| not told(expression, unknowing, hermetical, unbriefed) |
| obscure(clandestine, underground, undisclosed) |
| obscured(secret, hidden, clandestine, underground, underhanded) |
| occult(clandestine, underground, undisclosed) |
| out-of-the-way(clandestine, underground, undisclosed) |
| out of it(expression, idiom, unknowing, hermetical, unbriefed) |
| out of public view(expression, idiom, unknowing, hermetical, unbriefed) |
| out of view(expression, idiom, unknowing, hermetical, unbriefed) |
| out to lunch(expression, idiom, unknowing, hermetical, unbriefed) |
| pirate |
| privileged(sensitive, sub-rosa) |
| recondite(clandestine, underground, undisclosed) |
| reticent(clandestine, underground, undisclosed) |