| inscrutable(adjective, dull, dead, impassive, unresponsive) |
| lackluster(adjective, dull, dead, impassive, unresponsive) |
| laconic(aloof, reserved, reticent, uncommunicative) |
| lusterless(adjective, dull, dead, impassive, unresponsive) |
| mindless |
| mum(aloof, reserved, reticent, uncommunicative) |
| mute(aloof, reserved, reticent, dour, uncommunicative) |
| nobody home(expression, adjective, dull, dead, impassive) |
| quiet(aloof, reserved, reticent, uncommunicative) |
| reserved(aloof, reticent, uncommunicative) |
| reticent(aloof, reserved, uncommunicative) |
| sententious(aloof, reserved, reticent, dour, uncommunicative) |
| silent(aloof, reserved, reticent, uncommunicative) |
| sparing(aloof, reserved, reticent, dour, uncommunicative) |
| speechless(aloof, reserved, reticent, dour, uncommunicative) |
| stupid(adjective, dull, indifferent, dead, blank) |
| tight-lipped(aloof, reserved, reticent, uncommunicative) |
| tightlipped(adjective, taciturn) |
| unforthcoming(aloof, reserved, reticent, dour, uncommunicative) |
| unutterable |