Synonyms of quickly in English:

quickly


See definition of quickly

adverb

1‘he began to walk quickly’

SYNONYMS
fast, swiftly, rapidly, speedily, at high speed, with all speed, at speed, at full speed, at the speed of light, at full tilt, as fast as one's legs can carry one, at a gallop, briskly, at the double, post-haste, with all possible haste, like a whirlwind, like an arrow from a bow, at breakneck speed, expeditiously, madly, hotfoot, with dispatch
informal double quick, in double quick time, p.d.q., pretty damn quick, nippily, like lightning, like greased lightning, hell for leather, at warp speed, like mad, like crazy, like blazes, like the wind, like a bomb, like nobody's business, like a scalded cat, like the deuce, a mile a minute, like a bat out of hell, like a bullet out of a gun
British informal like the clappers, at a rate of knots, like billy-o
North American informal lickety-split
literary apace
ANTONYMS

slowly

2‘sensing her discomfort, he quickly went on’

SYNONYMS
immediately, directly, at once, now, straight away, right away, instantly, forthwith, as soon as possible, shortly, without delay, without further ado, without more ado, instantaneously, expeditiously, suddenly, abruptly
soon, soon after, promptly, early
North American momentarily
informal like a shot, ASAP, as soon as possible, pronto, before you can say Jack Robinson, before the ink is dry on the page, before you can say knife, straight off
archaic straight, instanter

3‘he calmed the animal and quickly inspected it’

SYNONYMS
briefly, fleetingly, briskly
hastily, in haste, precipitately, hurriedly, in a hurry, cursorily, perfunctorily, superficially, desultorily