DictionaryfastHigh speed
adjective / adverb

fast

FAST/fæst/

Moving or happening quickly.

The fast cheetah stretches into a powerful running stride across the grass.

A cheetah running at high speed, body fully stretched in a plausible stride over a small grassland patch, with a few expressive pen motion strokes.
Etymology

Old English fæst meant “firm, secure.” The speed sense may have developed through “strongly, vigorously,” as running hard means running fast, or through the image of a runner sticking close to a target.

In context

Grace Mandarin Chinese13:00
Many of you have been telling me that you struggle to hear Chinese tones in fast speech.
THIS is Why You Can’t Hear Tones in Fast Chinese Speech

More examples

  • She runs faster than anyone on the team.
  • We need to act fast before the water rises.
  • That was the fastest repair I have ever seen.

Forms

fast · faster · fastest

fast-paced adjective — Moving or changing very quickly

Similar words

quick
Often emphasizes taking little time rather than sustained speed.
rapid
Often more formal and used for movement or change.