| chop-chop(hot, quick, rapid, nimble, speedy) |
| cursory(fast, quick, rapid, speedy, swift) |
| curt(fast, irritable, rapid, swift, tetchy) |
| dangerously fast(expression, adjective, fast, quick, speedy) |
| double-quick |
| double-time(hot, quick, rapid, nimble, speedy) |
| double time(expression, fast, quick, brisk, hasty) |
| eagle-winged |
| early |
| electric(hot, quick, rapid, nimble, speedy) |
| flashing(hot, quick, rapid, nimble, speedy) |
| fleeting(hot, quick, rapid, nimble, speedy) |
| frantic(adjective, violent, fast, quick) |
| gone off half-cocked(expression, idiom, violent, fast, quick) |
| hair-trigger |
| hairtrigger(hot, quick, rapid, nimble, speedy) |
| harebrained(adjective, careless, wild, bold, thoughtless) |
| harefooted(prompt, fast, irritable, quick, abrupt) |
| hazardous |
| headstrong(adjective, bold, rash, reckless, risky) |