quickly

adverb

1)

he walked quickly

Syn:

fast, swiftly, briskly, rapidly, speedily, at the speed of light, at full tilt, as fast as one's legs can carry one, at a gallop, on the double, posthaste; informal PDQ (pretty damn quick), like lightning, like greased lightning, like mad, like blazes, like the wind, lickety-split; literary apace

2)

you'd better leave quickly

Syn:

immediately, directly, at once, now, straightaway, right away, instantly, forthwith, without delay, without further ado; soon, promptly, early, momentarily; informal like a shot, ASAP (as soon as possible), pronto, straight off

3)

he quickly inspected it

Syn:

briefly, fleetingly, briskly; hastily, hurriedly, cursorily, perfunctorily, superficially, desultorily