rapidity
Quality of quickness
Rapidity is the quality of being rapid—swiftness or speed.
The word appears in formal or technical contexts where *speed* might sound too casual: the rapidity of technological change, the rapidity with which the disease spread.
It emphasizes how fast something happens rather than how fast something moves.
State of being fast
- swiftnessQuickness of motion
- paceSpeed of movement
- velocityDirected rate of motion
- accelerationRate velocity changes
momentum · dash · sprint · gallop · race · zoom · whirl · express
Done too quickly
- rushedDone with excessive speed
- precipitateHeadlong and reckless
- freneticWildly agitated, fast
- impetuousActing on sudden urge
headlong · impulsive · abrupt · sudden · scramble · dash · scurry · hustle
Directed rate of motion
- accelerationRate velocity changes
- momentumProduct of mass, velocity
- kinematicsStudy of movement itself
- dynamicsStudy of forces
thrust · vectors · propulsion · g-force · aerodynamics · ballistics · centrifugal · centripetal
quickness
State of being fast
acceleration · momentum · dash · sprint · gallop · race · zoom · whirl · express · lightning
hurried
Done too quickly
- rushedDone with excessive speed
- precipitateHeadlong and reckless
- freneticWildly agitated, fast
impetuous · headlong · impulsive · abrupt · sudden · scramble · dash · scurry · hustle · bustle
velocity
Directed rate of motion
- accelerationRate velocity changes
- momentumProduct of mass, velocity
- kinematicsStudy of movement itself
dynamics · thrust · vectors · propulsion · g-force · aerodynamics · ballistics · centrifugal · centripetal · trajectory
- speedspeed, quickness, rate, velocity, pace
- speed termsacceleration, speedometer, momentum, terminal velocity, average speed
- particle physicsquark, quarks, lepton, leptons, boson
- spacetimespacetime, space-time, four-dimensional, tesseract, hypercube
- particle collisionscollision, elastic collision, scattering, nuclear reactions, energy transfer
rapidityslowness
Absence of quickness
sluggishness · lethargy · torpor · torpidity · pokiness
rapiditydeliberateness
Careful intention in action
deliberation · leisureliness · delay · procrastination · dilatoriness