At (full) speed, a mile a minute, and abruptly are all synonyms for rapidly. Slowly and gradually are these antonyms of rapidly. And here are another 49 synonyms for rapidly.
Rapidly Synonyms
- A mile a minute
- Abruptly
- At (full) speed
- At a gallop
- At a rate of knots
- At full tilt
- At the double
- At the speed of light
- At warp speed
- Before one can say knife
- Briskly
- Double quick
- Expeditiously
- Fast and furious
- Fast
- Hastily
- Hell for leather
- Hotfoot
- Hurriedly
- In a flash
- In a hurry
- In a rush
- In haste
- Lickety-split
- Like (greased) lightning
- Like a bat out of hell
- Like a bomb
- Like a madman/madwoman
- Like a scalded cat
- Like a shot
- Like a streak
- Like billy-o
- Like blazes
- Like crazy
- Like mad
- Like nobody's business
- Like the clappers
- Like the deuce
- Like the wind
- P.d.q. (pretty damn quick)
- Post-haste
- Precipitately
- Promptly
- Pronto
- Quickly
- Speedily
- Swiftly
- Apace