| hushful(adjective, close, quiet, soft, low) |
| 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, mysterious, private, reticent, taciturn) |
| inaudible(adjective, close, quiet, soft, low) |
| incommunicative(adjective, taciturn) |
| indisposed to talk(expression, idiom) |
| inobtrusive(adjective, quiet, soft, low) |
| low(adjective, close, quiet, soft, peaceful) |
| low-pitched(adjective, close, quiet, soft, low) |
| muffled(adjective, close, quiet, soft, low) |
| muted(adjective, close, quiet, soft, severe) |
| noiseless(adjective, close, quiet, soft, low) |
| not forthcoming(expression, quiet, shy, silent) |
| not saying boo(expression, adjective, idiom, close, quiet) |
| on the QT(expression, idiom, reserved, reticent, taciturn) |
| quiescent(adjective, close, quiet, soft, low) |
| quieted(adjective, close, quiet, soft, low) |