| flasher(showy, highpowered, chop-chop, supersonic, PDQ) |
| flat out(adverb, fast) |
| fleet of foot(expression, adjective, fast, quick, showy) |
| harefooted(highpowered, chop-chop, PDQ) |
| high-pressure(highpowered, chop-chop, PDQ) |
| high-speed(quick, rapid, speedy) |
| high pressure(expression, adjective, highpowered, chop-chop, PDQ) |
| highpowered(adjective, chop-chop, PDQ) |
| hotblooded(highpowered, chop-chop, PDQ) |
| immediate(quick, summary, rapid, speedy, instant) |
| in a little while(expression, idiom, soon, swiftly, snappily) |
| in a second(expression, idiom, soon, swiftly, snappily) |
| in advance(expression, soon, swiftly, snappily) |
| in due time(expression, idiom, soon, swiftly, snappily) |
| in good time(expression, idiom, soon, swiftly, snappily) |
| in the bud(expression, idiom, soon, swiftly, snappily) |
| in time(expression, soon, swiftly, snappily) |
| intoxicated(adjective, highpowered, chop-chop, PDQ) |
| invigorated(highpowered, chop-chop, PDQ) |
| lickety-split(adverb, fast) |