moving or able to move rapidly; swift
intended for rapid movement
the fast lane
conducive to rapidity of play or action or quickness of motion
a fast pitch
taking a comparatively short time
accomplished quickly
having or being a high photographic speed
fast film
said of a suburban train: express
indicating in advance of what is correct
The clock was fast
(often used in combinations) resistant to change from destructive action, fading, etc
colourfast
acid-fast bacteria
said of a colour: permanently dyed; not liable to fade
of a woman: forward or promiscuous
firmly fixed or attached
tightly closed or shut
said of friends: firm; steadfast
quick to learn
dissipated or wild
a fast set
said esp of a woman: forward or promiscuous
informal dishonest, shady, or acquired by dishonest means or with little effort
trying to make a fast buck