| unplanned(adjective, impulsive, rash, unthinking) |
| unpremeditated(adjective, impulsive, rash, unthinking) |
| active(adjective, express, hot, anxious, fast) |
| advanced(verb, adjective, expedited) |
| agile(prompt, energetic, hot, fast, quick) |
| alacritous(adjective, prompt, fast, quick, summary) |
| brash(adjective, quick, rash, reckless, impetuous) |
| breathless(adjective, hasty) |
| brusque(adjective, sudden, haste) |
| casual(adjective, slight, detail, trivial, quick) |
| chop-chop(adverb, hot, quick, rapid, nimble) |
| darted(verb, ran) |
| dashing(adjective, hot, quick, rapid, nimble) |
| double-time(adverb, hot, quick, rapid, nimble) |
| double time(expression, fast, quick, brisk, hasty) |
| expeditive(hot, fast, quick, nimble, speedy) |
| flashing(adjective, hot, quick, nimble, speedy) |
| galvanic(adjective, excitability) |
| haphazard |
| harum-scarum(violent, fast, quick) |