| speedily(adverb, fast, rapidly, hastily, earliness) |
| swiftly(adverb, fast, rapidly, hastily, pronto) |
| rapidly(adverb, fast, hastily, pronto) |
| promptly(adverb, fast, immediately, rapidly, pronto) |
| immediately(adjective, adverb, interjection, now, rapidly) |
| instantly(adverb, immediately, suddenly, punctually) |
| hastily(adverb, fast, rapidly, hastily, suddenly) |
| at once(expression, idiom, adverb, now, immediately) |
| instantaneously(adverb, fast, immediately, rapidly, suddenly) |
| directly(adverb, fast, immediately, rapidly, earliness) |
| pronto(adjective, adverb, informal, fast, immediately) |
| abruptly(adverb, fast, rapidly, hastily, suddenly) |
| fast(verb, adjective, adverb, fast, rapidly) |
| apace(adverb, fast, rapidly, earliness, pronto) |
| lickety-split(adjective, adverb, informal, fast) |
| hurriedly(adverb, fast, rapidly, hastily, pronto) |
| briskly(adverb, fast, rapidly, hastily, pronto) |
| forthwith(adverb, immediately, earliness, punctually) |
| without delay(expression, idiom, adverb, straight, now) |
| soon(adjective, adverb, immediately, rapidly, soon) |