Fast
Instantly
Instantly adverb - Without delay.
Usage example: showed leadership by reacting instantly to the crisis
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Synonyms for Instantly
Fast and instantly are semantically related. Sometimes you can use "Fast" instead an adverb "Instantly".
Mutual synonyms
Both words in one sentence
- Right next to it is a shopkeeper who instantly knows who you are, and one of the dialogue options is "News travels fast here."
Source: News Travels Fast -
These effects are somewhat exaggerated, especially the instantly working one - in real life, amphetamines work fast, but not that fast.
Source: Film / The Crimson Rivers - Try this against the Yeti when he pulls up the ice barrier, and Cless will instead get stuck in a lightning fast Cycle of Hurting that will kill him almost instantly.
Source: Cycle of Hurting
Cite this Source
Instantly and Fast. (2016). Retrieved 2026, July 22, from https://thesaurus.plus/related/fast/instantly
Fast & Instantly. N.p., 2016. Web. 22 Jul. 2026. <https://thesaurus.plus/related/fast/instantly>.
Instantly or Fast. 2016. Accessed July 22, 2026. https://thesaurus.plus/related/fast/instantly.
Google Ngram Viewer shows how "fast" and "instantly" have occurred on timeline