| clear(sound, reasonable, sensible, forceful, logical) |
| cogitative(adjective, reasonable, keen, sensible, deep) |
| cognitive(adjective, sound, reasonable, sensible, intelligent) |
| common sense |
| competent(adjective, smart, experience, know, capable) |
| complex |
| comprehensible(sound, articulate, logical, silver-tongued, well-spoken) |
| considered(adjective, reasonable, sensible, deliberate, restrained) |
| contemplative(adjective, reasonable, keen, sensible, deep) |
| conversant(adjective, smart, experience, know, capable) |
| cool-headed |
| coolheaded(calm, sound, reasonable, sensible) |
| crafty(adjective, sensible, intelligent, sage) |
| creditable(adjective, reasonable, realistic, authentic, satisfying) |
| cultivated(adjective, tolerant, progressive) |
| decimal |
| dependable(adjective, calm, good, sound, reasonable) |
| diplomatic(adjective, sensible, wise, shrewd) |
| disciplined(adjective, calm, quiet, reasonable, sensible) |
| earnest(adjective, calm, quiet, reasonable, keen) |