| insighted(adjective, understanding, keen, alert, sensitive) |
| intuitive(adjective, understanding, keen, sharp, smart) |
| knowledgeable(adjective, understanding, keen, sharp, smart) |
| observant(adjective, understanding, keen, sharp, smart) |
| on the ball(expression, adjective, idiom, smart, bright) |
| original(adjective, fast, subtle) |
| osmotic |
| poignant |
| precipitous |
| quick(adjective, understanding, keen, sharp, smart) |
| quick on the trigger(expression, adjective, idiom, smart, fast) |
| quick on the uptake(expression, adjective, idiom, smart, bright) |
| rational(adjective, understanding, keen, alert, sensitive) |
| ready(adjective, smart, bright, intelligent, clever) |
| responsive(adjective, understanding, keen, sharp, smart) |
| savvy(adjective, understanding, keen, sharp, smart) |
| sensitive(adjective, understanding, keen, sharp, smart) |
| sharp-sighted(adjective, smart, bright, intelligent, brilliant) |
| sharp-witted(adjective, smart, intelligent, brilliant, clever) |
| slick(adjective, smart, bright, intelligent, clever) |