(superl.) Not dilatory or slow; quick; swift; nimble; hasty; rapid in motion or performance; as, a speedy flight; on speedy foot.

abrupt agile alacritous alert apt breakneck brief brisk cometary cursory dashing decisive dispatchful double-quick eagle-winged electrifying expeditious express fast festinate feverish flashing fleet flickering flying furious galloping hair-trigger hasty headlong hurried hustling immediate impetuous impulsive instant instantaneous last-minute light of heel light-footed lively mercurial meteoric nerve-shattering nimble nimble-footed on the spot passing precipitant precipitate precipitous prompt punctual quick quick as lightning quick as thought raking rapid ready reckless running sharp shocking short short and sweet short-term short-termed slap-bang slapdash smart snap snappy spanking spry startling sudden summary superficial surprising swift unanticipated unexpected unforeseen unlooked-for unpredicted urgent winged