| Main Entry: | |
| Part of Speech: | adjective |
| Definition: | very fast |
| Synonyms: | fast, jiffy, quickly, rapidly, speed, swiftly |
| Antonyms: | slw |
| Main Entry: | hastily |
| Part of Speech: | adverb |
| Definition: | with great speed |
| Synonyms: | agilely, apace, carelessly, double-quick, expeditiously, fast, flat-out, heedlessly, hurriedly, impetuously, impulsively, lickety-split, nimbly, on spur of the moment, posthaste, precipitately, prematurely, promptly, quickly, rapidly, rashly, recklessly, speedily, straightaway, subito, suddenly, swiftly, thoughtlessly, too quickly, unpremeditatedly |
| Antonyms: | delayed, slowly |
| Main Entry: | on the double |
| Part of Speech: | adverb |
| Definition: | very quickly |
| Synonyms: | chop chop, chop-chop, double-time, expeditiously, fast, flat-out, fleetly, full tilt, hastily, hurried, hurriedly, in a flash, in double time, in haste, in high gear, lickety-split, lickety-split, like a shot, like greased lightning, like wildfire, promptly, pronto, quick, quickly, rapidly, snappily, speedily, swift, swiftly |
| Main Entry: | posthaste |
| Part of Speech: | adjective, adverb |
| Definition: | fast |
| Synonyms: | at once, breakneck, directly, double-quick, expeditious, flat-out, fleet, fleetly, full tilt, hastily, hasty, headlong, lickety-split, pell-mell, promptly, pronto, quick, quickly, rapid, rapidly, speedily, speedy, straightaway, swift, swiftly |
| Antonyms: | eventually, slow, slowly |
| Main Entry: | promptly |
| Part of Speech: | adverb |
| Definition: | immediately |
| Synonyms: | PDQ, at once, directly, expeditiously, fast, flat-out, fleetly, hastily, in nothing flat, instantly, lickety-split, like a shot, now, on the dot, on the double, on time, posthaste, pronto, punctually, quickly, rapidly, right away, sharp, speedily, straightaway, swiftly, unhesitatingly |
| Antonyms: | late, negligently |
| Main Entry: | quickly |
| Part of Speech: | adverb |
| Definition: | fast |
| Synonyms: | apace, briskly, chop-chop, expeditiously, flat-out, fleetly, full tilt, hastily, hurriedly, immediately, in a flash, in haste, in nothing flat, in short order, instantaneously, instantly, lickety-split, like a bat out of hell, like a flash, like a shot, promptly, pronto, quick, rapidly, speedily, swift, swiftly |
| Main Entry: | rapidly |
| Part of Speech: | adverb |
| Definition: | very quickly |
| Synonyms: | at speed, briskly, expeditiously, fast, flat out, full tilt, hastily, hurriedly, immediately, in a hurry, in a rush, in haste, lickety-split, like a shot, posthaste, precipitately, promptly, speedily, swiftly, with dispatch |
| Antonyms: | leisurely, slowly |
| Main Entry: | soon |
| Part of Speech: | adverb |
| Definition: | in the near future |
| Synonyms: | anon, any minute now, before long, betimes, by and by, coming down the pike, directly, early, ere long, expeditiously, fast, fleetly, forthwith, hastily, in a little while, in a minute, in a second, in a short time, in due time, in short order, in time, instantly, lickety-split, on time, posthaste, presently, promptly, pronto, quick, quickly, rapidly, short, shortly, speedily |
| Antonyms: | distant, far, later, never |