Fastness
Fastness noun - A high rate of movement or performance.
Usage example: the amazing fastness with which the boy took his shower had us wondering if he'd used any water
Speed is a synonym for fastness in swiftness topic. In some cases you can use "Speed" instead a noun "Fastness". popular alternative
Nearby Word: fasten
Speed
Speed noun - A high rate of movement or performance.
Usage example: we dashed off the remaining paperwork with as much speed as possible so we could leave for the long weekend
Fastness is a synonym for speed in velocity topic. You can use "Fastness" instead a noun "Speed", if it concerns topics such as swiftness, rapidity. popular alternative
Mutual synonyms
Cite this Source
Speed and Fastness. (2016). Retrieved 2026, August 16, from https://thesaurus.plus/related/fastness/speed
Fastness & Speed. N.p., 2016. Web. 16 Aug. 2026. <https://thesaurus.plus/related/fastness/speed>.
Speed or Fastness. 2016. Accessed August 16, 2026. https://thesaurus.plus/related/fastness/speed.
Google Ngram Viewer shows how "fastness" and "speed" have occurred on timeline