| hot-headed |
| hustling |
| hypersonic(hot, quick, rapid, nimble, speedy) |
| ill-advised(violent, wild, fast, quick, thoughtless) |
| in a jiffy(expression, idiom, hot, quick, nimble) |
| inconsiderate(wild, quick, thoughtless, rash, negligent) |
| indiscreet(violent, wild, fast, quick, thoughtless) |
| instant(prompt, fast, irritable, quick, summary) |
| instantaneous(fast, summary, rapid, swift, instant) |
| jump the gun(expression, idiom, violent, fast, quick) |
| lead out(expression, fast, rapid, swift) |
| lickety split(expression, adverb, hot, quick, nimble) |
| light of heel(expression, idiom) |
| like a bat out of hell(expression, idiom, hot, quick, nimble) |
| like all get out(expression, idiom, hot, quick, nimble) |
| like crazy(expression, hot, quick, nimble, speedy) |
| like mad(expression, hot, quick, nimble, speedy) |
| madcap(adjective, violent, careless, wild, fast) |
| move it(expression, fast, rapid, swift) |
| move on(expression, fast, rapid, swift) |