Effective
Both words in one sentence
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A half-youkai can do it too, being still half-human, but isn't as quick and effective.
Source: Manga / Yozakura Quartet - Splatterman is a supervillain whose regenerative powers are so quick and effective that he's pretty much immune to all harm.
Source: Nigh-Invulnerability -
It's a Mercy Kill because being poisoned is likely to be a much more quick and effective death compared to what the servant might have gotten as punishment for trying to assassinate the Queen.
Source: Mercy Kill
Cite this Source
Quick and Effective. (2016). Retrieved 2026, August 14, from https://thesaurus.plus/related/effective/quick
Effective & Quick. N.p., 2016. Web. 14 Aug. 2026. <https://thesaurus.plus/related/effective/quick>.
Quick or Effective. 2016. Accessed August 14, 2026. https://thesaurus.plus/related/effective/quick.
Google Ngram Viewer shows how "effective" and "quick" have occurred on timeline