What does speediest mean?
Speediest is the superlative form of fast, meaning having or travelling at the greatest possible speed. It can describe a person, vehicle, route, method, or process: the speediest route may avoid traffic, while the speediest computer completes a task first. In its less common adverbial use, speediest means with the greatest speed, as in a phrase describing the quickest way to complete an action. Although entirely standard, speediest is somewhat more formal and less frequent than fastest, which is usually the preferred everyday form. The word is especially useful in comparisons involving movement, travel, technology, or the efficient completion of tasks. Its formation follows the regular English pattern in which fast becomes faster and fastest, while the related adjective speedy can likewise form speedier and speediest.
Having the greatest speed; faster than all others of the same kind.
"The speediest train reached the station ahead of schedule."
Speediest is a valid but less common alternative to fastest, particularly in formal or descriptive writing.
With the greatest speed or in the quickest manner.
"The files were transferred at the speediest possible rate."
The adverbial use is less frequent than the adjectival use; fastest is usually more natural in everyday English.
Speediest belongs to a small family of comparatives built by adding -ier and -iest to speed: speedy, speedier, speediest.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does speediest come from?
Speediest is formed from the adjective fast by adding the comparative suffix -ier and the superlative suffix -iest, following the regular pattern used with many short adjectives. The related adjective speedy was formed from speed, which comes from Old English spēd, meaning speed, quickness, or success. Fast itself has the same general Germanic and Old English ancestry, with an Old English form fæst. Speediest therefore belongs to the native English family of fast, faster, and fastest, while sharing its root conceptually with speed and speedy.
Related word forms
How speediest is actually used
Speediest is grammatically standard but less common than fastest. It is especially natural in formal or descriptive writing and in fixed expressions such as speediest route and speediest car; fastest is preferred in everyday usage.
Easily confused with speediest
Fastest is the standard and much more common superlative of fast, while speediest is a less frequent but valid alternative.