Clean
Both words in one sentence
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They soar at 7,000 meters above the ground, where the air is still clean and safe.Still, something is always moving on the surface.
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In Batman: Arkham City, the entrance to the abandoned Wonder City features a recorded message declaring the city a safe haven from the pollution and corruption of Gotham City, where Lazarus technology provides safe and clean energy for its' citizens.
Source: New Era Speech -
Dystopia: Future London looks clean and safe, but not very comfortable.
Source: Series / K9
Cite this Source
Safe and Clean. (2016). Retrieved 2026, July 22, from https://thesaurus.plus/related/clean/safe
Clean & Safe. N.p., 2016. Web. 22 Jul. 2026. <https://thesaurus.plus/related/clean/safe>.
Safe or Clean. 2016. Accessed July 22, 2026. https://thesaurus.plus/related/clean/safe.
Google Ngram Viewer shows how "clean" and "safe" have occurred on timeline