| aesthetic(perceptive, observant) |
| alive to(expression, perceptive, observant) |
| appreciative(familiar, informed, well-informed) |
| apprised(familiar, perceptive, informed, observant, well-informed) |
| argute(sharp, smart, astute) |
| assured(perceptive, observant) |
| astucious(sharp, smart, intelligent, wise, learned) |
| attentive(perceptive, observant) |
| au courant(expression, familiar, perceptive, informed, observant) |
| biting(critical, meaningful, incisive) |
| boiled down(expression, critical, meaningful, incisive) |
| cagey(sharp, smart, intelligent, wise, learned) |
| calling a spade a spade(expression, idiom, critical, meaningful, incisive) |
| careful(sound, sharp, sensible, sensitive, intelligent) |
| cautious(sensitive, discreet, diplomatic) |
| certain(perceptive, observant) |
| civil(sensitive, discreet, diplomatic) |
| clear-headed |
| clued-up(familiar, informed, well-informed) |
| cogitative(sensible, intelligent, sage) |