| clear-headed |
| cold-blooded(adjective, calm, detached, unemotional, composed) |
| cold-fish(adjective, calm, detached, unemotional, composed) |
| collectedness |
| comfortable(adjective, calm, unconcerned, unruffled, untroubled) |
| comfy(adjective, calm, unconcerned, unruffled, untroubled) |
| commodious(adjective, calm, unconcerned, unruffled, untroubled) |
| complacent(calm, cool, unflappable) |
| content(adjective, calm, unconcerned, unruffled, untroubled) |
| contented(adjective, calm, unconcerned, unruffled, untroubled) |
| cool as a cucumber(expression, idiom, calm, composed) |
| cool as cucumber(expression, idiom, calm, cool, unflappable) |
| cool cat(expression, adjective, calm, detached, unemotional) |
| coolheaded |
| cozy(adjective, calm, unconcerned, unruffled, untroubled) |
| cursive(adjective, calm, unconcerned, unruffled, untroubled) |
| cushy(adjective, calm, unconcerned, unruffled, untroubled) |
| deliberate(calm, composed) |
| detached(adjective, calm, unemotional, composed) |
| dignified |