| slow(adjective, quiet, cool, still, peaceful) |
| smooth(adjective, quiet, cool, still, peaceful) |
| sober(adjective, calm, quiet, cool, serene) |
| solemn(adjective, calm, quiet, cool, sober) |
| somber(adjective, calm, quiet, cool, sober) |
| soothing(adjective, quiet, cool, still, peaceful) |
| stately(calm, cool, dignified) |
| stolid(adjective, calm, cool, indifferent, philosophic) |
| stormless(adjective, quiet, cool, still, peaceful) |
| taciturn(adjective, silent, dazed, dumb, astonished) |
| thick-skinned(adjective, calm, cool, unaffected, collected) |
| thunderstruck(adjective, silent, dazed, dumb, amazed) |
| tight-lipped(adjective, silent, dazed, dumb, astonished) |
| tongue-tied(adjective, silent, dazed, dumb, amazed) |
| unagitated(adjective, cool, restrained, resigned, stoical) |
| uncommunicative(adjective, silent, dazed, dumb, astonished) |
| unflustered(calm, cool, unflappable) |
| unspeaking(silenced, whist, disimpassioned) |
| voiceless(adjective, silent, dazed, dumb, amazed) |
| waveless(adjective, quiet, cool, still, peaceful) |