SYN: Greedy, ravenous, voracious, predaceous, avaricious, grasping, extortionate.
ANT: Bountiful, liberal, contented, frugal.
=
KEY: Rapid.
SYN: Quick, swift, speedy, accelerated, flying.
ANT: Slow, tardy, retarded, cumbrous, lazy.
=
KEY: Rapidity.
SYN: Quickness, swiftness, speed, velocity, celerity, dispatch.
ANT: Slowness, tardiness, cumbrousness, delay.