| acute(adjective, important, quick, serious, essential) |
| ad hoc(expression, adjective, present, free, fake) |
| alert(adjective, keen, energetic, active, fast) |
| approximate |
| available(adjective, close, warm, near, accessible) |
| bordering(adjective, close, warm, near, handy) |
| breakneck(prompt, fast, irritable, quick, summary) |
| brewing(near, likely, possible, imminent, forthcoming) |
| brusque(adjective, irritable, tetchy, sudden, snippy) |
| burning(adjective, close, warm, prompt, important) |
| close at hand(expression, adjective, idiom, close, warm) |
| cursory(fast, rapid, swift, instant) |
| directly |
| extemporaneous(noun, adjective, free, casual, impulsive) |
| first(adjective, delay) |
| flashing(adjective, quick, rapid, speedy, instant) |
| fleet(adjective, prompt, fast, quick, abrupt) |
| fleeting(adjective, quick, rapid, speedy, instant) |
| flying(fast, quick, summary, rapid, speedy) |
| forthwith |