n.
快速, 敏捷

[ noun ]
the property of being prompt and efficient
<noun.attribute>
it was done with dispatch

Expeditious \Ex`pe*di"tious\, a.
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. -- {Ex`pe*di"tious*ly}, adv.
-- {Ex`pe*di"tious*ness}, n.

Syn: Prompt; ready; speedy; alert. See {Prompt}.