rapid (n.)
rapid (adj.)
- abrupt
- agile
- alacritous
- bluff
- bold
- breakneck
- brisk
- ceaseless
- constant
- continual
- dashing
- double-quick
- expeditious
- express
- fast
- fleet
- flying
- hasty
- headlong
- high-speed
- hurried
- immediate
- impetuous
- incessant
- instant
- instantaneous
- light-footed
- lively
- mercurial
- nimble
- oscillating
- perennial
- perpetual
- precipitate
- precipitous
- prompt
- quick
- reckless
- regular
- repeated
- running
- sharp
- sheer
- snappy
- spanking
- speedy
- staccato
- steady
- steep
- sudden
- sustained
- swift
- unbroken
- unceasing
- unchanging
- uninterrupted
- unremitting
- unvarying
- vertical
- winged
