| nimble-witted(adjective, smart, bright, shrewd, clever) |
| penetrative(understanding, keen, sensitive, perceptive, penetrating) |
| perspicuous |
| sane(adjective, sound, reasonable, sensible, intelligent) |
| sharp-sighted |
| slick(adjective, sharp, ability, smart, bright) |
| sophisticated(adjective, sensible, intelligent, wise, shrewd) |
| tactful(adjective, smooth, sensible, intelligent, wise) |
| thoughtful(adjective, sound, reasonable, sensible, intelligent) |
| able(smart, bright, shrewd, clever, brainy) |
| accurate(adjective, sharp, smart, sensible, wise) |
| apperceptive(perceptive, observant, insightful) |
| arch |
| artful(adjective, sharp, smart, intelligent, shrewd) |
| attentive(adjective, perceptive, observant, insightful) |
| awake(understanding, keen, sensitive, perceptive, observant) |
| calculating(adjective, keen, sharp, smart, bright) |
| clairvoyant |
| conscious(understanding, keen, sensitive, perceptive, intellectual) |
| delicate(adjective, smooth, wise, prudent, tactful) |