| certain(adjective, understanding, keen, sensible, alert) |
| civil(considerate, cautious, responsive, helpful, tactful) |
| clear-sighted(alert, intelligent, attentive, watchful, sharp-eyed) |
| coached |
| cocked |
| competent(adjective, cool, significant, intelligent, brilliant) |
| comprehending(alert, intelligent, attentive, watchful, sharp-eyed) |
| conservative(thoughtful, sober, cautious, prudent, wary) |
| considerate(careful, thoughtful, cautious, responsive, prudent) |
| contemplating(alert, intelligent, attentive, watchful, sharp-eyed) |
| controlled(cautious, tactful, circumspect) |
| cool(adjective, deliberate, alert, significant, intelligent) |
| correct(alert, intelligent, attentive, watchful, sharp-eyed) |
| covering |
| crack(adjective, cool, significant, intelligent, brilliant) |
| custodial |
| deducing(alert, intelligent, attentive, watchful, sharp-eyed) |
| deliberate(adjective, cool, complete, total, alert) |
| detecting(alert, intelligent, attentive, watchful, sharp-eyed) |
| diplomatic(cautious, tactful, circumspect) |