| brainy |
| quick(adjective, ability, smart, bright, skillful) |
| adept(smart, bright, skillful, sharp-witted, nimble-witted) |
| adroit(smart, bright, skillful, sharp-witted, nimble-witted) |
| alert(adjective, ability) |
| all there(expression, smart, bright, active, wise) |
| bright(adjective, ability, sharp-witted, quick-thinking) |
| brilliant |
| canny(bright, sharp-witted, quick-thinking) |
| capable(bright, active, wise, sharp-witted, quick-thinking) |
| competent(bright, active, wise, sharp-witted, quick-thinking) |
| effective(bright, active, wise, sharp-witted, quick-thinking) |
| effectual(bright, active, wise, sharp-witted, quick-thinking) |
| keen(adjective, ability, smart, skillful, nimble-witted) |
| nimble-witted(smart, bright, active, wise, skillful) |
| on the ball(expression, idiom, bright, sharp-witted, quick-thinking) |
| perceptive(bright, sharp-witted, quick-thinking) |
| quick-witted(adjective, ability, smart, bright, skillful) |
| quick on the draw(expression, idiom, smart, bright, active) |
| quick on the trigger(expression, idiom, smart, bright, skillful) |