moving or capable of moving at high speed

a fast and powerful car

(of a clock or watch) showing a time ahead of the correct time

I keep my watch fifteen minutes fast

firmly fixed or attached

he made a rope fast to each corner

(of a film) needing only a short exposure

a 35-mm colour film which is ten times faster than Kodacolor II

(of a dye) not fading in light or when washed

the dyes are boiled with the yarn to produce a fast colour

engaging in or involving activities characterized by excitement, extravagance, and risk-taking

the fast life she led in London

(of a person) prone to act in an unacceptably familiar way

Mammy said, ‘Stop asking questions, you too damn farse.’