| plain(adjective, calm, quiet, simple, sensible) |
| played down(expression, adjective, subdued, understated, unglamorous) |
| quiescent(adjective, dull, quiet, cool, smooth) |
| rational(adjective, calm, quiet, reasonable, sensible) |
| reasonable(adjective, calm, quiet, soft, gentle) |
| reposeful(adjective, quiet, cool, smooth, slow) |
| reposing(adjective, quiet, cool, smooth, slow) |
| restful(adjective, quiet, cool, smooth, mild) |
| reticent |
| rural(adjective, quiet, cool, smooth, slow) |
| sedate(adjective, calm, quiet, cool, reasonable) |
| sedentary(adjective, dull, idle, sluggish, lazy) |
| self-effacing(adjective, modest, inconspicuous, unremarkable) |
| serene(adjective, calm, quiet, cool, smooth) |
| serious(adjective, calm, quiet, gentle, sensible) |
| severe(adjective, calm, quiet, reasonable, sensible) |
| shaded(adjective, quiet, gentle, restrained, sober) |
| simple(adjective, modest, unsophisticated, ironic, deadpan) |
| slack(dull, sluggish, lazy, motionless, unmoving) |
| sleepy(adjective, dull, idle, sluggish, lazy) |