| perspicacious(adjective, person, keen, sharp, smart) |
| sharp(adjective, understanding, strong, open, cool) |
| keen(adjective, clear, understanding, strong, smooth) |
| discerning(adjective, clear, understanding, cool, sound) |
| intelligent(adjective, clear, understanding, cool, sound) |
| wise(adjective, clear, understanding, cool, sound) |
| astute(adjective, understanding, cool, sound, smooth) |
| shrewd(adjective, understanding, sound, smooth, keen) |
| acute(adjective, understanding, strong, smooth, keen) |
| sensitive(adjective, understanding, open, keen, sharp) |
| sagacious(adjective, clear, understanding, cool, sound) |
| alert(adjective, understanding, strong, open, keen) |
| observant(adjective, person, understanding, strong, open) |
| percipient(adjective, understanding, cool, keen, sharp) |
| clever(adjective, cool, sound, smooth, keen) |
| aware(adjective, understanding, open, cool, sound) |
| quick(adjective, understanding, cool, keen, sharp) |
| insightful(adjective, understanding, cool, sound, keen) |
| incisive(adjective, understanding, strong, keen, sharp) |
| judicious(adjective, clear, understanding, cool, sound) |