| foxy(adjective, smooth, keen, sharp, smart) |
| gifted(adjective, smart, bright, brainy) |
| grounded(adjective, sensible, alert, familiar, wise) |
| heedful(adjective, sharp, bright, lively, alert) |
| highbrow(smart, bright, brainy) |
| impressible(adjective, understanding, keen, fine, sensible) |
| impressive |
| in the know(expression, idiom, cool, smooth, keen) |
| in the picture(expression, idiom, sensible, alert, familiar) |
| learned(sound, sharp, familiar, intelligent, wise) |
| nimble-witted(adjective, smart, bright, intelligent, clever) |
| normal(reasoning, intellectual, mental) |
| observing(observant, insightful) |
| omniscient(familiar, informed, well-informed) |
| on the beam(expression, idiom, sensible, alert, familiar) |
| on to(expression, understanding, cool, sensible, alert) |
| plugged in(expression, cool, sensible, alert, familiar) |
| polite(adjective, sensitive, discreet, diplomatic) |
| practical(alert, reasoning, intellectual, mental, lucid) |
| probing(adjective, sharp, smart, careful, intelligent) |