| animated(energetic, fast, swift) |
| brash(adjective, quick, speedy, sudden, hurried) |
| brusque(adjective, irritable, tetchy, sudden, snippy) |
| direct(adjective, prompt, fast, straight, spontaneous) |
| electric(hot, quick, velocity, speedy) |
| flashing(adjective, hot, quick, speedy, immediate) |
| fleet-footed(adjective, urgent) |
| fleeting(adjective, hot, quick, speedy, hasty) |
| hurrying(adjective, fast) |
| impulsive(adjective, quick, abrupt, hasty, unexpected) |
| keen(fast, swift) |
| light of heel(expression, idiom, velocity) |
| meteoric(adjective, brief, sudden) |
| nimble-footed |
| on the double(expression, adjective, hot, fast, quick) |
| plunging(violent, fast, quick) |
| precipitant(violent, fast, quick, abrupt, hasty) |
| pronto(hot, fast, quick, summary, speedy) |
| quick as thought(expression, idiom, instantaneity) |
| quicken(verb, velocity) |