| smart(adjective, precise, irritable, quick, responsive) |
| strong |
| dashing(adjective, wonderful, hot, fast, quick) |
| impulsive(adjective, quick, thoughtless, unthinking, abrupt) |
| light |
| out of the blue(adjective, sudden) |
| posthaste(adjective, adverb, hot, fast, quick) |
| rapidly(adverb, quickly, speedily) |
| speedily(adverb, quickly, rapidly) |
| spry(adjective, sharp, lively, fast, brisk) |
| swiftly(adverb, quickly, rapidly, snappily, speedily) |
| cursory(adjective, fast, casual, quick, speedy) |
| flashing(adjective, hot, quick, speedy, immediate) |
| light-footed(adjective, fast) |
| presto(adjective, hot, fast, quick, rapid) |
| rushing(adjective, violent, fast, quick, abrupt) |
| sprightly(adjective, sharp, lively, fast, quick) |
| summary(adjective, prompt, fast, casual, quick) |
| supersonic(adjective, prompt, hot, fast, quick) |
| unhesitating |