Rapidly
Synonyms Quickly, swiftly, at (full) speed, post-haste, at full tilt, expeditiously, promptly, in a hurry, hastily, in a rush, abruptly, double quick, in a flash, at warp speed, at the double, like (greased) lightning, like mad, like blazes, like the wind, like nobody's business, like the deuce, before one can say knife, at a rate of knots, lickety-split, fast, speedily, at the speed of light, hotfoot, at a gallop, briskly, hurriedly, fast and furious, in haste, precipitately, like a shot, p.d.q. (pretty damn quick), hell for leather, pronto, like a bat out of hell, like a madman/madwoman, like crazy, like a streak, like a bomb, like a scalded cat, a mile a minute, like the clappers, like billy-o, and apace.
Example Sentences
Technology is advancing rapidly these days.
She is improving rapidly in class.
The weather changed rapidly overnight.
His heart was beating rapidly.