| au courant(expression, understanding, cool, sensible, alert) |
| au fait(expression, adjective, familiar, knowledgeable, skilled) |
| cagey(adjective, smooth, keen, sharp, smart) |
| circumspect(adjective, sharp, bright, sensible, lively) |
| clear-headed |
| clear-sighted(adjective, sharp, alert, intelligent, wise) |
| clearheaded(adjective, lucid) |
| cogent(clear, sound, reasonable, sensible, rational) |
| comprehending(smart, bright, alert, familiar, intelligent) |
| consequent(clear, sound, reasonable, sensible, rational) |
| contemplative(sound, sharp, sensible, intelligent, wise) |
| cool(adjective, alert, significant, familiar, rational) |
| dainty(adjective, particular, finicky) |
| deep(adjective, clear, strong, tough, severe) |
| deft(adjective, keen, sharp, smart, bright) |
| eagle-eyed(adjective, alert, intelligent, attentive, watchful) |
| eloquent(significant, expressive, meaningful) |
| exacting(sensitive, intelligent, shrewd) |
| familiar(adjective, cool, sensible, alert, wise) |
| farseeing(wise, psychic, clairvoyant, visionary, mystic) |