| discreet(close, restricted, inside, clandestine, underground) |
| disguised(clandestine, underground, undisclosed) |
| dissembled(close, restricted, clandestine, underground, discreet) |
| dissimulated(close, restricted, inside, clandestine, underground) |
| enigmatic(mysterious, private, reticent, taciturn, covert) |
| hidlings |
| hushed(mysterious, private, reticent, taciturn, covert) |
| in ambush(expression, close, sensitive, restricted, clandestine) |
| in chambers(expression, mysterious, private, reticent, taciturn) |
| in privacy(expression, mysterious, private, reticent, taciturn) |
| in private(expression, mysterious, private, reticent, taciturn) |
| in the background(expression, idiom, mysterious, reticent, taciturn) |
| in the dark(expression, idiom, mysterious, reticent, taciturn) |
| incognito(close, restricted, clandestine, underground, discreet) |
| inside(close, restricted, clandestine, underground, discreet) |
| latent |
| lurking |
| mysterious(private, reticent, clandestine, underground, undisclosed) |
| on the QT(expression, idiom, sensitive, reticent, taciturn) |
| private(mysterious, reticent, clandestine, underground, undisclosed) |