| effectual(bright, active, wise, sharp-witted, quick-thinking) |
| energetic |
| fleet(sharp, lively, robust, sprightly, vivacious) |
| frisky |
| keen(smart, intelligent, clever, skillful, nimble-witted) |
| knowing(smart, bright, intelligent, clever, sharp-witted) |
| limber |
| lithe(sharp, lively, robust, sprightly, vivacious) |
| lively |
| mercurial |
| nimble-witted(smart, bright, active, intelligent, wise) |
| on the ball(expression, idiom, smart, bright, clever) |
| perceptive(smart, bright, intelligent, clever, sharp-witted) |
| prompt(sharp, smart, bright, lively, clever) |
| quick(adjective, sharp, smart, bright, lively) |
| quick-witted(adjective, sharp, smart, bright, lively) |
| quick on the trigger(expression, idiom, sharp, bright, lively) |
| quick on the uptake(expression, idiom, smart, bright, active) |
| rapid |
| ready(sharp, smart, bright, lively, clever) |