| unclear(adjective, quiet, soft, low, still) |
| uncommunicable(adjective, quiet, restraint, taciturn, sounds) |
| untalkative(adjective, quiet, tightlipped) |
| untroubled(adjective, calm, quiet, smooth, tranquil) |
| deaf(adjective, deaf) |
| antisocial(adjective, aloof, reserved, reticent, uncommunicative) |
| aphasic |
| buttoned up(expression, adjective, close, quiet, smooth) |
| clammed up(expression, adjective, close, quiet, smooth) |
| closed up(expression, adjective, close, quiet, soft) |
| cool(adjective, quiet, indifferent, restrained, modest) |
| crabbed |
| curt(aloof, reserved, reticent, taciturn, uncommunicative) |
| diffident(adjective, quiet, simple, indifferent, humble) |
| dim |
| flick |
| formal(adjective, aloof, reticent, standoffish) |
| frigid(adjective, aloof, reticent, standoffish) |
| icy(adjective, aloof, reticent, standoffish) |
| indescribable(adjective, nameless, understood, implied, unspoken) |