| acute(adjective, understanding, keen, sharp, sensitive) |
| astute(adjective, understanding, keen, sharp, sensitive) |
| discreet(adjective, understanding, keen, sharp, alert) |
| ear to the ground(expression, adjective, idiom, understanding, keen) |
| gnostic(adjective, understanding, keen, sharp, sensitive) |
| incisive(adjective, understanding, keen, sharp, alert) |
| insightful(adjective, understanding, keen, sharp, sensitive) |
| intuitive(adjective, understanding, keen, alert, sensitive) |
| judicious(adjective, understanding, keen, sharp, sensitive) |
| knowing(adjective, understanding, keen, sharp, sensitive) |
| knowledgeable(adjective, understanding, keen, sharp, sensitive) |
| penetrating(adjective, understanding, sharp, sensitive, perceptive) |
| penetrative(adjective, understanding, keen, alert, sensitive) |
| perceptive(adjective, understanding, keen, sharp, alert) |
| percipient(adjective, understanding, keen, sharp, sensitive) |
| perspicacious(adjective, understanding, keen, sharp, sensitive) |
| rational(adjective, understanding, keen, sharp, alert) |
| sagacious(adjective, understanding, keen, sharp, sensitive) |
| sage(adjective, understanding, keen, sharp, sensitive) |
| sensitive(adjective, understanding, keen, sharp, piercing) |