| analytical(clear, sound, reasonable, sensible, rational) |
| applied(adjective, reasonable, sensible, useful, sober) |
| arguable(adjective, sound, sensible, rational, intelligent) |
| at ease(expression, adjective, calm, relaxed, tranquil) |
| believable(adjective, sound, sensible, rational, intelligent) |
| both feet on the ground(expression, adjective, idiom, reasonable, sensible) |
| businesslike(adjective, reasonable, sensible, useful, sober) |
| calm(adjective, sound, reasonable, sensible, relaxed) |
| calmed(adjective, calm, relaxed, tranquil, easygoing) |
| canny(adjective, reasonable, rational, sober, wise) |
| cerebral(adjective, sound, sensible, rational, intelligent) |
| circumspect(adjective, reasoning, intellectual, mental) |
| clear-cut(adjective, sound, sensible, rational, intelligent) |
| clear-headed |
| clearheaded(adjective, calm, relaxed, tranquil, easygoing) |
| cogent(clear, sound, reasonable, sensible, rational) |
| cognitive(adjective, sound, sensible, rational, intelligent) |
| coherent(adjective, clear, sound, reasonable, sensible) |
| collected(adjective, calm, reasonable, sensible, relaxed) |
| compelling(clear, sound, reasonable, sensible, rational) |