| clouded(obscure, unknown, clandestine, underground, undisclosed) |
| conspiratorial(obscure, unknown, clandestine, underground, undisclosed) |
| covered(obscure, unknown, clandestine, underground, undisclosed) |
| discreet(close, inside, clandestine, underground, undisclosed) |
| disguised(obscure, unknown, clandestine, underground, undisclosed) |
| dissembled(close, clandestine, underground, undisclosed, furtive) |
| dissimulated(close, inside, clandestine, underground, undisclosed) |
| enigmatical(obscure, deep, unknown, clandestine, underground) |
| esoteric(adjective, obscure, unknown, clandestine, underground) |
| hush-hush(intimate, secret, private, clandestine, underground) |
| in ambush(expression, close, sensitive, inside, clandestine) |
| incognito(close, clandestine, underground, undisclosed, furtive) |
| inside(close, intimate, secret, private, clandestine) |
| mysterious(adjective, obscure, unknown, clandestine, underground) |
| obscure(adjective, unknown, clandestine, underground, undisclosed) |
| off the record(expression, adjective, idiom, intimate, secret) |
| on the QT(expression, idiom, obscure, sensitive, private) |
| out-of-the-way(obscure, deep, unknown, clandestine, underground) |
| postern |
| private(adjective, obscure, intimate, secret, unknown) |