| adept(adjective, light, smooth, sharp, smart) |
| cunning(adjective, good, sharp, smart, bright) |
| expert(adjective, cool, smart, bright, skill) |
| facile(adjective, smooth, easy, ability, confident) |
| galloping(adjective, fast, velocity, hasty, urgent) |
| irascible(adjective, nervous, emotional, restless, volatile) |
| knowing(adjective, sharp, smart, bright, skill) |
| posthaste(adjective, adverb, hot, fast, speedy) |
| quick-tempered(adjective, nervous, emotional, restless, volatile) |
| soon(adjective, adverb, immediate, directly, quickly) |
| speedily(adverb, early, quickly, rapidly, instantly) |
| unexpected(adjective, passionate, violent, fast, abrupt) |
| vivacious(adjective, sharp, bright, energetic, lively) |
| able(adjective, smart, bright, rational, careful) |
| apace(adverb, fast, quickly, rapidly, speedily) |
| dashing(adjective, cool, keen, express, intense) |
| fast paced(adjective, speed) |
| fresh(adjective, cool, pleasant, keen, sharp) |
| impulsive(noun, adjective, nervous, emotional, thoughtless) |
| living(life, alive, existing, breathing) |