| clouded(clandestine, underground, undisclosed) |
| covered(clandestine, underground, undisclosed) |
| cretinous(unknowing, hermetical, unbriefed) |
| deep(clandestine, underground, undisclosed) |
| enigmatical(clandestine, underground, undisclosed) |
| esoteric(clandestine, underground, undisclosed) |
| for eyes only(expression, idiom, sensitive, sub-rosa) |
| fraudulent(secret, private, hidden, sneaky, covert) |
| hermetical(unknowing, unbriefed) |
| hot-headed(unknowing, hermetical, unbriefed) |
| ignorant(unknowing, hermetical, unbriefed) |
| imperceivable(unknowing, hermetical, unbriefed) |
| in a corner(expression, idiom, unknowing, hermetical, unbriefed) |
| in chambers(expression, unknowing, hermetical, unbriefed) |
| in privacy(expression, unknowing, hermetical, unbriefed) |
| in private(expression, unknowing, hermetical, unbriefed) |
| in secret(expression, unknowing, hermetical, unbriefed) |
| in the background(expression, idiom, secret, unknowing, hermetical) |
| in the dark(expression, idiom, unknowing, hermetical, unbriefed) |
| kept concealed(expression, sensitive, sub-rosa) |