| hairtrigger(hot, quick, rapid, nimble, speedy) |
| harefooted(prompt, fast, quick) |
| high-speed(quick, rapid, speedy) |
| hot(quick, rapid, nimble, speedy, brisk) |
| immediate(prompt, fast, quick, summary, rapid) |
| in a jiffy(expression, idiom, hot, quick, nimble) |
| inaudible |
| lickety split(expression, hot, quick, nimble, speedy) |
| like a bat out of hell(expression, idiom, hot, quick, nimble) |
| like all get out(expression, idiom, hot, quick, nimble) |
| lissome(prompt, fast, quick) |
| lively(prompt, fast, quick) |
| on the double(expression, idiom, hot, quick, nimble) |
| posthaste(hot, quick, rapid, nimble, speedy) |
| precipitate(prompt, fast, quick, summary, rapid) |
| presto(hot, quick, rapid, nimble, speedy) |
| prompt(fast, quick, summary, rapid, speedy) |
| pronto(hot, quick, summary, nimble, speedy) |
| quick(prompt, hot, fast, summary, rapid) |
| quick-fire(prompt, fast, quick) |