| buttoned up(expression, adjective, close, quiet, smooth) |
| clammed up(expression, adjective, close, quiet, smooth) |
| close(adjective, quiet, soft, restrained) |
| close-mouthed(adjective, close, quiet, smooth, soft) |
| closemouthed(quiet, soft, still, silent) |
| could hear a pin drop(expression, adjective, idiom, close, quiet) |
| faint(adjective, close, quiet, soft, gentle) |
| hushful(adjective, close, quiet, smooth, soft) |
| inobtrusive(adjective, quiet, soft) |
| low-pitched(adjective, close, quiet, soft) |
| nonvocal(quiet, soft, still, silent) |
| not saying boo(expression, adjective, idiom, close, quiet) |
| not talkative(expression, quiet, soft, still) |
| quieted(adjective, close, quiet, soft) |
| reserved(adjective, close, quiet, soft) |
| reticent(adjective, close, quiet, soft) |
| secretive(adjective, close, quiet, soft) |
| stilled(adjective, close, quiet, soft) |
| taciturn(adjective, close, quiet, soft) |
| tight-lipped(adjective, close, quiet, soft) |