| acute(adjective, understanding, keen, sensitive, perceptive) |
| alert(adjective, understanding, keen, sharp, smart) |
| astute(adjective, understanding, keen, sharp, smart) |
| awake(adjective, understanding, keen, sharp, smart) |
| aware(adjective, understanding, keen, sharp, smart) |
| brainy(adjective, understanding, keen, sharp, smart) |
| conscious(adjective, understanding, keen, sharp, smart) |
| discerning(adjective, understanding, keen, sharp, smart) |
| discreet(adjective, understanding, keen, alert, sensitive) |
| gnostic(adjective, understanding, keen, alert, sensitive) |
| incisive(adjective, understanding, keen, alert, sensitive) |
| insighted(adjective, understanding, keen, alert, sensitive) |
| insightful(adjective, understanding, keen, sensitive, shrewd) |
| intuitive(adjective, understanding, keen, sharp, smart) |
| keen(adjective, understanding, sharp, smart, alert) |
| knowing(adjective, understanding, keen, sharp, smart) |
| knowledgeable(adjective, understanding, keen, sharp, smart) |
| observant(adjective, understanding, keen, sharp, smart) |
| penetrating(adjective, understanding, sharp, smart, sensitive) |
| penetrative(adjective, understanding, keen, sharp, smart) |