| impulsive(noun, adjective, extraordinary, careless, wonderful) |
| brisk(adjective, fast, quick, rapid, speedy) |
| short(adjective, adverb, quick, brief, abrupt) |
| startling(adjective, extraordinary, wonderful, affected, shocking) |
| precipitant(adjective, violent, fast, quick, impulsive) |
| sheer(adjective, sharp, vertical) |
| speedy(adjective, fast, quick, abrupt, rapid) |
| abruptly(adverb, short, suddenly, unexpectedly, unawares) |
| accelerated(adjective, fast, abrupt, rapid, swift) |
| dramatic(adjective, moving, affected, exciting, immediate) |
| expeditious(adjective, fast, quick, abrupt, rapid) |
| fleet(adjective, fast, quick, abrupt, rapid) |
| instant(adjective, prompt, irritable, summary, bad-tempered) |
| shocking(adjective, extraordinary, wonderful, astonishing, astounding) |
| snap(noun, adjective) |
| unannounced |
| unplanned(noun, adjective, impulsive, rash, unthinking) |
| momentary(adjective, brief, immediate, instant, transitory) |
| reckless(noun, adjective, careless, casual, quick) |
| snappy(adjective, keen, energetic, violent, active) |