(a.) Speedy; efficient\; possessed of, or characterized by, expedition, or efficiency and rapidity in action; performed with, or acting with, expedition; quick; having celerity; speedily; as, an expeditious march or messenger.

agile alacritous alert apt breakneck brisk cursory dashing decisive diligent dispatchful double-quick eagle-winged effective effectual efficacious efficient express fast festinate feverish fleet flying furious galloping hair-trigger hasty headlong hurried hustling immediate instant instantaneous last-minute light of heel light-footed lively mercurial nimble nimble-footed on the spot passing precipitate prompt punctual quick quick as lightning quick as thought rapid ready reckless running sharp slap-bang slapdash smart snap snappy spanking speedy spry summary superficial swift urgent winged