| civil(adjective, quiet, cool, moderate, gentle) |
| clearheaded(adjective, calm, relaxed, tranquil, easygoing) |
| cold(adjective, calm, cool, relaxed, casual) |
| cold-fish(adjective, calm, detached, sober, unfeeling) |
| commonsensical(adjective, calm, reasonable, sensible, relaxed) |
| complacent(adjective, calm, cool, solid, certain) |
| compliant(adjective, quiet, indifferent, apathetic, lifeless) |
| concluded(adjective, firm, determined, usual, regular) |
| confirmed(adjective, firm, solid, certain, determined) |
| connected(adjective, dull, steady, stable, regular) |
| consistent(adjective, calm, dull, smooth, firm) |
| continual(adjective, dull, steady, stable, regular) |
| cool cat(expression, adjective, calm, detached, sober) |
| coolheaded(adjective, calm, quiet, cool, sound) |
| customary(adjective, firm, determined, usual, regular) |
| dead set on(expression, adjective, idiom, set, firm) |
| decided(adjective, firm, solid, certain, determined) |
| decisive(adjective, firm, determined, usual, regular) |
| definite(adjective, firm, solid, certain, determined) |
| dependable(adjective, calm, sound, reasonable, sensible) |