быстро

1) General subject: amain, aptly, at a good bat, at a quick pace, at the double, betimes, briefly, currente calamo, dartingly, flat, flat out, fleetingly, hand over fist, hotfoot, in (at) full pelt, in double-quick time, in short order, jargon, lightly, like a shot, like smoke, like the wind, neck and crop, nimbly, overnight, pat, pitter-patter, prompt, quick, quickly, rapidly, readily, roundly, skittishly, slick, soon, speedily, sweepingly, swift, swiftly, telegraphically, thick and fast, throw (в определенное состояние), trippingly, wham bam, with celerity, with despatch (to do something with despatch - делать что-либо быстро), with dispatch (do something with dispatch - делать что-либо быстро), with speed, apace, play fast and loose, promptly, at a rate of knots, in a whisper, fast (e.g. He drives fast - Он водит машину быстро)

2) Medicine: celeriter

3) Colloquial: bob, flat-out, in a crack, like a house on fire, make it snappy, live-o (Mostly used in the UK.)

4) American: pronto, wham-bam

5) Poetical language: fleetly

6) Latin: cito

7) Military: hubba-hubba

8) Religion: apace (In a swift manner, with speed, quickly)

9) Economy: at a high rate

10) Music: rapidamente, subito, veloce

11) Scottish language: belive

12) Jargon: hell to split, in no time, jet up, lickety-split, on the double, slippy, some, two shakes of a lamb's tail, horse apple

13) Astronautics: rapid

14) American English: at a good clip, at a steady clip

15) Makarov: at full pelt, currente calamo (лат., букв. беглым пером), in full pelt, like a blue streak, suddenly, thick, with expedition

16) Taboo: a-helling, hell to toot

17) Gold mining: at a brisk pace