alacritous

accelerated brisk expeditious hasty hurried immediate prompt rapid swift

agile breakneck express fleet harefooted headlong lissome lively nimble precipitate quick-fire rapid-fire ready snappy split-second summary supersonic ultrasonic winged

delayed leisurely slow sluggish

halted slowed tardy

abrupt expeditious hasty nimble quick rapid speedy sudden unexpected

cracking express fleet flying precipitate prompt ready screaming short spanking

barrelling breakneck double-quick fleet-footed headlong hurried in nothing flat like crazy like mad on the double pronto shaking a leg short-lived snappy speedball supersonic winged

delayed expected lazy leisurely slow

sluggish