Synonyms of 'high-speed'
It takes a mile and a half to stop a high-speed train.
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A brisk activity or action is done quickly and in an energetic way.
The horse broke into a brisk trot.
Express is used to describe special services which are provided by companies or organizations such as the Post Office, in which things are sent or done faster than usual for a higher price.
A special express service is available.
Thesaurus for high-speed from the Collins English Thesaurus
employing or requiring a very short exposure time