| laconic(adjective, aloof, reserved, reticent, uncommunicative) |
| laid-back(adjective, cool, cold, sensitive, shy) |
| lone wolf(adjective, person) |
| nongregarious(adjective, quiet, cool, cold, restrained) |
| on ice(adjective, person) |
| on the QT(expression, adjective, idiom, reticent, taciturn) |
| recessive(adjective, cool, cold, sensitive, shy) |
| reclusive(adjective, quiet, cool, cold, restrained) |
| retired(adjective, quiet, restrained, thoughtful, reserved) |
| secluded(adjective, quiet, reserved, secret, private) |
| sensitive(adjective, cool, cold, shy, hostile) |
| sententious(adjective, aloof, reserved, reticent, dour) |
| solitary(adjective, quiet, cold, restrained, detached) |
| sparing(adjective, aloof, reserved, reticent, dour) |
| speechless(adjective, aloof, reserved, reticent, dour) |
| stuck-up(adjective, cool, cold, sensitive, shy) |
| tight |
| tight chops(expression, adjective, quiet, reserved, secret) |
| unbending(adjective, cool, cold, sensitive, shy) |
| uncompanionable(adjective, quiet, cold, restrained, detached) |