| buttoning up(expression, adjective, quiet, reserved, secret) |
| clamming up(expression, adjective, quiet, reserved, secret) |
| close(adjective, quiet, reserved, secret, reticent) |
| close-lipped(adjective, quiet, reserved, secret, private) |
| closemouthed(adjective, quiet, reserved, secret, private) |
| hidden(adjective, quiet, reserved, secret, private) |
| hush-hush(adjective, quiet, reserved, secret, private) |
| retired(adjective, quiet, reserved, secret, private) |
| secluded(adjective, quiet, reserved, secret, private) |
| secretive(adjective, quiet, reserved, secret, private) |
| silent(adjective, quiet, reserved, secret, private) |
| tight-lipped(adjective, quiet, reserved, secret, private) |
| uncommunicative(adjective, quiet, reserved, secret, private) |
| unforthcoming(adjective, quiet, reserved, secret, private) |
| mum(adjective, quiet, silent, taciturn) |
| quiet(adjective, reticent, silent, taciturn, tight-lipped) |
| reserved(adjective, quiet, secret, private, reticent) |
| reticent(adjective, quiet, reserved, secret, private) |
| secret(adjective, quiet, reserved, private, reticent) |
| taciturn(adjective, quiet, reserved, secret, private) |