Instantly
Instantly adverb - Without delay.
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Synonyms for Instantly
Overnight and instantly are semantically related. In some cases you can use "Overnight" instead an adverb "Instantly".
Overnight
Overnight adverb - During or for the length of one night.
Both words in one sentence
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When he dies, his mother instantly has another child, who ages to Kenny's age overnight.
Source: Born-Again Immortality -
In The Boondocks, Huey creates a highly explosive gel solution, but doesn't tell Granddad that until after he discovers that it instantly grows out your hair overnight.
Source: No Product Safety Standards -
Barney recovered from their split almost instantly and was back to his self-centered, womanizing self basically overnight.
Source: Series / How I Met Your Mother
Cite this Source
Overnight and Instantly. (2016). Retrieved 2026, August 13, from https://thesaurus.plus/related/instantly/overnight
Instantly & Overnight. N.p., 2016. Web. 13 Aug. 2026. <https://thesaurus.plus/related/instantly/overnight>.
Overnight or Instantly. 2016. Accessed August 13, 2026. https://thesaurus.plus/related/instantly/overnight.
Google Ngram Viewer shows how "instantly" and "overnight" have occurred on timeline