| acute(adjective, sharp, energetic, lively, alert) |
| blistering(adjective, urgent) |
| bustling(adjective, sharp, energetic, lively, effective) |
| dizzy(adjective, urgent) |
| fast-paced |
| impatient(adjective, violent, fast, irritable, quick) |
| posthaste(adjective, adverb, hot, fast, quick) |
| punctual(adjective, prompt, precise, quick, responsive) |
| quick as lightning(expression, idiom, velocity, instantaneity) |
| rapid-fire(adjective, prompt, fast, quick, urgent) |
| rash(adjective, violent, fast, quick, abrupt) |
| reckless(adjective, violent, fast, quick, sudden) |
| rushed(adjective, quick, summary, unexpected, instant) |
| short(adjective, fast, casual, quick, summary) |
| strong |
| timely(adjective, precise, quick, responsive, flexible) |
| unhesitating |
| urgent(adjective, quick, speedy, hasty, sudden) |
| without warning(expression, adjective, violent, fast, quick) |
| spanking |