| buttoned up(verb, expression, adjective, close, quiet) |
| close(verb, adjective, quiet, soft, low) |
| close-mouthed(adjective, close, quiet, smooth, soft) |
| dumb(verb, adjective, close, quiet, soft) |
| hushed(adjective, close, quiet, smooth, soft) |
| mute(verb, adjective, close, quiet, soft) |
| noiseless(adjective, close, quiet, smooth, soft) |
| quiet(verb, adjective, close, soft, suppress) |
| reserved(adjective, close, quiet, soft, low) |
| reticent(adjective, close, quiet, soft, low) |
| silent(adjective, close, quiet, smooth, soft) |
| taciturn(adjective, close, quiet, soft, low) |
| tight-lipped(adjective, close, quiet, soft, low) |
| uncommunicative(adjective, close, quiet, soft, low) |
| unspeaking(adjective, close, quiet, soft, low) |
| zipped(careful, shy, reticent, ambiguous, taciturn) |
| aloof(reserved, reticent, taciturn, uncommunicative) |
| antisocial(aloof, reserved, reticent, uncommunicative) |
| at rest(expression, adjective, calm, quiet, smooth) |
| backstairs(mysterious, private, reticent, unknowing, taciturn) |