| secretive(adjective, quiet, still, reserved) |
| quiet(adjective, soft, low, still) |
| tight-lipped(adjective, quiet, reserved, secret) |
| uncommunicative(adjective, close, quiet, soft, low) |
| reserved(adjective, close, quiet, restrained, still) |
| tongue-tied(quiet, still, reticent, silent) |
| bashful(quiet, soft, still, silent) |
| hushed(quiet, soft, low, still) |
| muted(quiet, soft, low, reticent) |
| nonvocal(quiet, soft, low, still) |
| not talkative(expression, quiet, reticent, silent) |
| soundless(quiet, soft, low, still) |
| unsociable(quiet, still, silent, hushed) |
| unspeaking(quiet, still, silent, hushed) |
| voiceless(quiet, soft, low, still) |
| zipped(quiet, still, reticent, silent) |
| not forthcoming(expression, quiet, silent, tight-lipped) |