Natural
Surefire
Surefire adjective - Not likely to fail.
Mutual synonyms
Both words in one sentence
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Regardless of whichever reason, floating or hanging disembodied eyes are a surefire way to indicate that something is not all natural.
Source: The Walls Have Eyes
Cite this Source
Surefire and Natural. (2016). Retrieved 2026, August 14, from https://thesaurus.plus/related/natural/surefire
Natural & Surefire. N.p., 2016. Web. 14 Aug. 2026. <https://thesaurus.plus/related/natural/surefire>.
Surefire or Natural. 2016. Accessed August 14, 2026. https://thesaurus.plus/related/natural/surefire.
Google Ngram Viewer shows how "natural" and "surefire" have occurred on timeline