Fast
Fast adverb - With great speed.
Instantaneously and fast are semantically related. In some cases you can use "Instantaneously" instead an adverb "Fast".
Instantaneously
Instantaneously adverb - Without delay.
Usage example: I had just slammed the car door shut when I instantaneously remembered that I had left the keys inside
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Synonyms for Instantaneously
Fast and instantaneously are semantically related. Sometimes you can use "Fast" instead an adverb "Instantaneously".
Nearby Word: instantaneous
Mutual synonyms
Related pairs
- quick and fast
- quick and instantaneously
- swift and fast
- swift and instantaneously
- quickly and fast
- quickly and instantaneously
- rapidly and fast
- rapidly and instantaneously
- expeditiously and fast
- expeditiously and instantaneously
- speedily and fast
- speedily and instantaneously
- swiftly and fast
- swiftly and instantaneously
Both words in one sentence
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Ships at sea could communicate with each other or their home bases instantaneously (or at least as fast as a message could be keyed into a telegraph and relayed along) instead of having to send messengers directly.
Source: Simple, yet Awesome -
Incidentally, that helps to illuminate the fact that people can be decelerated from terminal velocity pretty dang fast and still survive, just not instantaneously; otherwise parachutes would be useless.
Source: Not the Fall That Kills You - The difference with the later invention of foldspace engines and their need for prescient navigators or forbidden computers is that folding space gets you to your destination pretty much instantaneously—which is why nobody's fast enough to keep up with it unless they've already seen the safe path.
Source: Casual Interstellar Travel
Cite this Source
Instantaneously and Fast. (2016). Retrieved 2026, August 13, from https://thesaurus.plus/related/fast/instantaneously
Fast & Instantaneously. N.p., 2016. Web. 13 Aug. 2026. <https://thesaurus.plus/related/fast/instantaneously>.
Instantaneously or Fast. 2016. Accessed August 13, 2026. https://thesaurus.plus/related/fast/instantaneously.
Google Ngram Viewer shows how "fast" and "instantaneously" have occurred on timeline