Fast
Fast adverb - With great speed.
Usage example: run as fast as you can to get help
Immediately and fast are semantically related In some cases you can use "Immediately" instead the word "Fast" as an adverb or an adjective or a interjection.
Immediately
Immediately adverb - Without delay.
Usage example: if we don't leave immediately, we'll be late for the concert
Fast and immediately are semantically related in quickly topic. Sometimes you can use "Fast" instead the word "Immediately" as an adverb or an adjective or a interjection.
Mutual synonyms
Related pairs
Both words in one sentence
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If two hyper bombs are pointed directly at one another and set off at the same time, the two holes they create are "linked" — anything entering one hole travels through parallel space infinitely fast and immediately exits the other.
Source: Literature / The Pentagon War - Nyarko-san, Nyarko's explanation for why she's on Earth gets fast-forwarded almost immediately, complete with VHS-style distortion.
Source: Fast-Forward Gag -
Fast forward a few hours later, she immediately appears before him wearing a bridal veil and her personal stuff in tow, immediately declaring him as her husband.
Source: Manga / Okusama Ga Seito Kaichou
Cite this Source
Immediately and Fast. (2016). Retrieved 2026, August 15, from https://thesaurus.plus/related/fast/immediately
Fast & Immediately. N.p., 2016. Web. 15 Aug. 2026. <https://thesaurus.plus/related/fast/immediately>.
Immediately or Fast. 2016. Accessed August 15, 2026. https://thesaurus.plus/related/fast/immediately.
Google Ngram Viewer shows how "fast" and "immediately" have occurred on timeline