| vigilant(adjective, understanding, cool, reasonable, sensible) |
| watchful(adjective, understanding, cool, reasonable, smart) |
| worldly-wise(adjective, cool, reasonable, smart, sensible) |
| adroit(adjective, smooth, keen, smart, bright) |
| all-knowing |
| apperceptive(perceptive, observant, insightful) |
| apprehensive(adjective, cool, significant, intelligent, brilliant) |
| argute(sharp, smart, intelligent, clever, astute) |
| attentive(adjective, understanding, reasonable, sensible, restrained) |
| au fait(expression, adjective, familiar, informed, well-informed) |
| balanced(adjective, sound, reasonable, reason, sensible) |
| clear-sighted(adjective, sharp, smart, sensible, sensitive) |
| competent(adjective, good, cool, sharp, smart) |
| conscious(adjective, understanding, cool, reasonable, keen) |
| critical(sharp, sensitive, piercing, astute, discriminating) |
| dexterous(smart, shrewd, clever, subtle, artful) |
| diplomatic(smooth, sensible, wise, cautious, shrewd) |
| expedient(smooth, sensible, careful, wise, tight) |
| far-seeing |
| foreknowing |