| mercurial |
| neat(skillful, nimble, artful, practiced) |
| nifty(skillful, nimble, artful, practiced) |
| nimble(fast, skillful, subtle, sprightly, supple) |
| nimble-witted(smart, bright, skillful, sharp-witted, quick-thinking) |
| no dummy(expression, smart, quick, competent, capable) |
| not born yesterday(expression, idiom, fast, quick, competent) |
| on the ball(expression, idiom, bright, skillful, nimble) |
| on the beam(expression, idiom, smart, skillful, nimble) |
| penetrative(smart, fast, skillful, subtle, nimble-witted) |
| perceptive(bright, sharp-witted, quick-thinking) |
| proficient(smart, skillful, nimble, artful, meritable) |
| prompt(sharp, lively, quick, competent, capable) |
| quick(adjective, sharp, smart, bright, lively) |
| quick-witted(sharp, smart, bright, lively, skillful) |
| quick on the draw(expression, idiom, sharp, bright, lively) |
| rapid |
| ready(sharp, bright, lively, quick, competent) |
| receptive(bright, sharp-witted, quick-thinking) |
| savvy(bright, quick, competent, capable, skillful) |