rapidest
Speediest of all
Rapidest is the superlative form of rapid, meaning fastest or most swift.
While *most rapid* is more common in formal writing, rapidest appears in casual speech and older texts: the rapidest growth we've seen in decades.
The word sounds slightly archaic or playful to modern ears.
Directed rate of motion
- accelerationRate velocity changes
- momentumProduct of mass, velocity
- fastestMost rapid of all
- swiftestMost rapid possible
quickest · lightning · supersonic · hypersonic · mach · celerity · fleeting · instantaneous
Serious sudden danger
- crisisDecisive dangerous moment
- immediacyQuality of being direct
- pressingRequiring immediate attention
- criticalExpressing disapproval or importance
dire · haste · expedite · imperative · priority · swift · timely · response
velocity
Directed rate of motion
- accelerationRate velocity changes
- momentumProduct of mass, velocity
- fastestMost rapid of all
swiftest · quickest · lightning · supersonic · hypersonic · mach · celerity · fleeting · instantaneous · express
emergency
Serious sudden danger
- crisisDecisive dangerous moment
- immediacyQuality of being direct
- pressingRequiring immediate attention
critical · dire · haste · expedite · imperative · priority · swift · timely · response · rescue
sprint
Brief maximum-speed effort
athletics · championship · swimming · cycling · track · regatta · dash · qualifier · record-breaking · podium
explosive
Prone to sudden detonation
powerful · fierce · turbulent · volatile · impetuous · tempestuous · furious · ferocious · relentless · frenzied