| foxy(adjective, smart, bright, intelligent, cunning) |
| gifted(adjective, smart, bright, intelligent, competent) |
| high-speed(adjective, direct, express, prompt, fast) |
| hub(noun, place, start, point, emotion) |
| inside(noun, center, middle, target) |
| insightful(adjective, understanding, cool, keen, sharp) |
| lickety-split(adverb, informal, fast) |
| light-footed(adjective, fast) |
| masterful(adjective, cunning, expert, skilled, capable) |
| smooth(adjective, light, easy, smart, clean) |
| snap(noun, adjective, express, hot, rapid) |
| snappily(adverb, soon, swiftly) |
| spanking(adjective, clear, pleasant, sharp, bright) |
| straightaway |
| subtle(adjective, sharp, smart, exact, cunning) |
| testy(nervous, irritable, emotional, restless, volatile) |
| touchy(nervous, irritable, emotional, restless, volatile) |
| unhesitating |
| vital(adjective, pleasant, energetic, lively, ready) |
| vivid(adjective, clear, pleasant, sharp, bright) |