| tranquil(adjective, calm, characteristic, serene, calmness) |
| calm(adjective, characteristic, serene, calmness, tranquillity) |
| serene(adjective, calm, characteristic, calmness, tranquillity) |
| placid(adjective, calm, mild, characteristic, serene) |
| quiet(adjective, calm, mild, serene, characteristic) |
| undisturbed(adjective, calm, state, quiet, smooth) |
| still(adjective, calm, quiet, serene, cool) |
| pacific(adjective, calm, quiet, cool, smooth) |
| halcyon(adjective, calm, quiet, smooth, mild) |
| unruffled(adjective, calm, serene, quiet, cool) |
| peaceable(adjective, friendly, peace, state, characteristic) |
| restful(adjective, quiet, serene, calm, smooth) |
| gentle(adjective, mild, temperate, characteristic, calm) |
| cool(adjective, calm, state, quiet, smooth) |
| untroubled(adjective, calm, state, characteristic, quiet) |
| composed(adjective, calm, quiet, characteristic, mild) |
| smooth(adjective, calm, quiet, characteristic, cool) |
| relaxed(adjective, calm, feature, state, characteristic) |
| sedate(adjective, calm, characteristic, quiet, state) |
| even(adjective, mild, calm, quiet, gentle) |