| noiseless(adjective, close, quiet, soft, low) |
| nonchalant(adjective, calm, relaxed, tranquil, easygoing) |
| not saying boo(expression, adjective, idiom, close, quiet) |
| not turn a hair(expression, adjective, idiom, calm, relaxed) |
| peaced |
| placid(adjective, calm, relaxed, tranquil, easygoing) |
| poised(adjective, calm, relaxed, tranquil, easygoing) |
| possessed(adjective, calm, relaxed, tranquil, easygoing) |
| quenched |
| quiescent(adjective, close, quiet, soft, low) |
| quieter |
| quietest |
| reconciled(verb, pacified) |
| repressed(adjective, calm, relaxed, restrained, tranquil) |
| reserved(adjective, close, quiet, soft, low) |
| reticent(adjective, close, quiet, soft, low) |
| secretive(adjective, close, quiet, soft, low) |
| sedate(adjective, calm, relaxed, tranquil, easygoing) |
| self-assured(adjective, calm, relaxed, tranquil, easygoing) |
| self-possessed(adjective, calm, relaxed, tranquil, easygoing) |