| in no time(expression, idiom, adverb, quick, rapidly) |
| in nothing flat(expression, idiom, soon, swiftly, snappily) |
| in short order(expression, idiom, soon, swiftly, snappily) |
| indiscreet(adjective, violent, fast, quick) |
| instant(adjective, sudden) |
| instantaneous(adjective, sudden) |
| jump the gun(expression, adjective, idiom, violent, fast) |
| lickety split(expression, soon, swiftly, snappily, posthaste) |
| like a bat out of hell(expression, idiom, soon, swiftly, snappily) |
| like a shot(expression, idiom, soon, swiftly, snappily) |
| like a thunderbolt(expression, idiom) |
| like greased lightning(expression, idiom, soon, swiftly, snappily) |
| like wildfire(expression, soon, swiftly, snappily, posthaste) |
| madcap(adjective, violent, fast, quick) |
| more rapidly(expression, soon, swiftly, snappily, posthaste) |
| off the hip(expression, adjective, idiom, violent, fast) |
| off the top of head(expression, adjective, idiom, violent, fast) |
| on spur of moment(expression, idiom, adverb, quickly, unexpectedly) |
| on the double(expression, idiom, soon, swiftly, snappily) |
| out-of-the-way |